【单选题】
电源系统中安装了两台EGIU（电源接口组件），它们分别接受哪个系统的信号？___
A. 两台EGIU分别接受相应GCU1、2的参数信号
B. 两台EGIU分别接收外电源和APU发电机的参数信号
C. 一台EGIU接收外电源和APU发电机的参数信号；另一台接收GCU1、2的参数信号
D. 一台EGIU接收GCU1和外电源的参数信号；另一台EGIU接收GCU2和APU发电机的参数信号
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相关试题
【单选题】
电源系统中静变流机的运转方式是：___
A. 当仅仅在只有电瓶工作的情况下，静变流机工作
B. 当有一台主发电机故障的情况下，静变流机工作
C. 当两台主发电机及APU发电机均故障的情况下，静变流机工作
D. 只要飞机电源系统接通电源的情况下，静变流机一直工作
【单选题】
对于厨房的自动卸载，正确的说法是：___
A. 在空中或地面状态，当只有一台主发电机工作的情况下系统将卸载厨房的大部分电源供应
B. 在空中或地面状态，当只有一台主发电机工作的情况下系统将卸载厨房的全部电源供应
C. 只有处于地面状态，当只有一台主发电机工作的情况下系统将卸载厨房的大部分电源供应
D. 只有处于空中状态，当只有一台主发电机工作的情况下系统将卸载厨房的全部电源供应
【单选题】
飞机电瓶的主参数是通过（——）在（——）显示。___
A. 相应的BCL（电瓶充电限制器）；下ECAM显示器上的ELEC页面
B. 相应的BCL（电瓶充电限制器）；上ECAM显示器上的ELEC页面
C. 相应的GCU；下ECAM显示器上的ELEC页面
D. 相应的GCU；上ECAM显示器上的ELEC页面
【单选题】
飞机电源系统在紧急的情况下，静变流机将来自（——）的28V直流电转换为115V交流电提供给飞机基本重要系统使用。___
A. BAT1
B. BAT2
C. BAT1和BAT2共同提供
D. BAT1或BAT2
【单选题】
飞机电源向电网1、2（ACBUS1、ACBUS2）提供电源的优先次序是：___
A. 1）APU发电机；2）相应的发电机；3）地面电源；4）其它发电机
B. 1）地面电源；2）APU发电机；3）相应的发电机；4）其它发电机
C. 1）相应的发电机；2）地面电源；3）APU发电机；4）其它发电机
D. 1）相应的发电机；2）其它发电机；3）地面电源；4）APU发电机
【单选题】
驾驶舱头顶板中的35VUELEC面板上的“ACESSFEED”按钮电门的作用是：___
A. 在ACBUS2电源丢失的情况下，通过此电门接通ACBUS1电源，继续向ACESSBUS和ACSHEDESSBUS提供电源
B. 在ACBUS1电源丢失的情况下，通过此电门接通静变流机应急电源，继续向ACESSBUS和ACSHEDESSBUS提供电源
C. 在ACBUS1电源丢失的情况下，通过此电门接通ACBUS2电源，继续向ACESSBUS和ACSHEDESSBUS提供电源
D. 在ACBUS1电源丢失的情况下，通过此电门接通CSM/G应急电源，继续向ACESSBUS和ACSHEDESSBUS提供电源
【单选题】
静变流机自动工作的条件是：___
A. ACBUS1电源丢失，及空速大于50公里
B. ACBUS2电源丢失，及空速大于50公里
C. CSM/G（应急马达发电机）不可用
D. A和B和C故障状况同时存在
【单选题】
燃油冷却的IDG滑油冷却器受到IDG滑油温度热电偶的监控，其作用是：___
A. 监控IDG冷却器的散热效果良好
B. 监控IDG滑油温度在容许的范围内
C. 监控IDG滑油滤是否堵塞
D. 使用温度信号对IDG滑油温度进行自动调节
【单选题】
外电源系统中（——）检测电源质量处于良好状态后，系统发出信号去：___
A. GPCU；燃亮驾驶舱头顶板外电源面板“EXTPWR”电门上“AVAIL”标示及外电源插座托架“EXTPWR/AVAIL”琥珀色灯
B. GCU1；燃亮驾驶舱头顶板外电源面板“EXTPWR”电门上“AVAIL”标示及外电源插座托架“EXTPWR/AVAIL”琥珀色
C. GPCU；燃亮驾驶舱头顶板外电源面板“EXTPWR”电门上“AVAIL”标示及外电源插座托架“EXT/PWRNOTINUSE”白色灯
D. GCU1；燃亮驾驶舱头顶板外电源面板“EXTPWR”电门上“AVAIL”标示及外电源插座托架“EXTPWR/AVAIL”琥珀色
【单选题】
在地面试车维护期间，如果左IDG发生过热或非正常低压故障，头顶板上IDG电门上的“FAULT”标示也燃亮。此时，试车的工作人员应当如何处理？___
A. 马上按压头顶35VU电气面板上的左IDG电门，使IDG脱开
B. 马上关断发动机
C. 马上按压头顶35VU电气面板上的左发电机电门，是IDG停止工作
D. 对系统影响不大，可稍后再处理
【单选题】
在地面维护的情况下，如果需要对应急马达发电机（CSM/G）进行测试，需要：___
A. 接通黄液压系统压力来驱动CSM/G
B. 接通绿液压系统压力来驱动CSM/G
C. 接通蓝液压系统压力来驱动CSM/G
D. 接通任一液压系统压力，均可驱动CSM/G
【单选题】
在正常情况下ACBUS1向ACESSBUS及ACSHEDESSBUS提供电源。当ACBUS1失去电源后，可以通过（——）继续向ACESSBUS和ACSHEDESSBUS供电。___
A. 电源控制系统将自动接通ACBUS2
B. 人工按压驾驶舱头顶电源面板上的“ACESSFEED”电门，接通ACBUS2电源
C. 静变流机将自动工作
D. TR（变压整流器）将自动工作
【单选题】
主发电机在正常工作状态下，如果一个系统探测到一个过压故障，那么操作人员将会在驾驶舱观察到那些现象？___
A. 相应发电机按钮电门上的“FAULT”标示将被燃亮，“MASTERCAUT”灯燃亮
B. 上ECAM显示器显示琥珀色的相关故障信息；下ECAM自动跳出“ELEC”页面
C. 听到单谐音；在下ECAM的“ELEC”页面看到系统将可用的电源转换到丢失电源的供电网络
D. A、B、C
【单选题】
电源系统中EGIU（）将主要电气参数通过429总线，将数据传送到（——）并在（——）系统上显示。___
A. GCU（发电机控制器）；ECAM
B. SDAC（系统数据采集器）；CDU
C. GCU；CDU
D. SDAC；ECAM
【单选题】
电源系统中那些汇流条或电源向ESSTR供电？___
A. ACESSBUS或CSM/G（应急马达发电机）
B. ACBUS1或ACBUS2
C. ACESSBUS或CSM/G
D. ACESSBUS或ACBUS1
【单选题】
飞机在空中状态下，当电源系统中ACBUS1和ACBUS2电源丢失，以及CSM/G（应急马达发电机）不可用，在这种情况下电源系统将：___
A. RAT（冲压涡轮）将自动释放，为系统提供有限的液压和应急电源
B. 静变流机将自动工作，为部分重要汇流条提供应急电源
C. TR（变压整流器）将自动工作，为部分重要汇流条提供应急电源
D. 由BAT1和BAT2向部分重要汇流条提供应急电源
【单选题】
飞行中,什么状况会使得驾驶舱IDG1(2)的按钮FAULT灯点亮,提示机组人工脱开IDG___
A. IDG输出电压低
B. IDG滑油温度过高或IDG滑油压力低.
C. IDG转速过高.
D. IDG滑油温度低或滑油压力高
【单选题】
驾驶舱20VU（头顶控制面板）中电源控制面板上APU的发电机按钮电门上的“FAULT”标示燃亮，这表明：___
A. APU的GCU探测到系统内部存在的故障会造成发电机或电网损坏
B. APU的发电机电门处于OFF位置
C. 表明连接APU发电机与飞机电网的GLC（）处于脱开位置
D. A、B、C均正确
【单选题】
驾驶舱头顶35VU“ELEC”面板“GALLEY”电门通常设置在AUTO方式下，电门上的“FAULT”标示灯在什么情况下会自动燃亮？___
A. 前厨房被卸载
B. 后厨房被卸载
C. 前后厨房均被卸载
D. 当APU或IDG任一发电机被系统探测到过载
【单选题】
控制主发电机的两台GCU和控制APU发电机的GCU，它们是否能互换？各自功能是通过（——）来实现。___
A. 3个GCU是相同的，可以互换；软件
B. 不能互换；程序钉
C. 3个GCU是相同的，可以互换；程序钉
D. 不能互换；软件
【单选题】
两台发动机正常运转，在一般的情况下GEN1（1号发电机）提供电源到（——），GEN2（2号发电机）提供电源到（——）。___
A. GEN1向ACBUS1和ACBUS2汇流条供电；GEN2向ACESSENTIALBUS和ACSHEDDABLEESSENTIALBUS汇流条供电
B. GEN1向ACBUS1、ACESSENTIALBUS和ACSHEDDABLEESSENTIALBUS汇流条供电；GEN2向ACBUS2汇流条供电
C. GEN1向ACESSENTIALBUS和ACSHEDDABLEESSENTIALBUS汇流条供电；GEN2向ACBUS1和ACBUS2汇流条供电
D. GEN1向ACBUS1汇流条供电；GEN2向ACBUS2、ACESSENTIALBUS和ACSHEDDABLEESSENTIALBUS汇流条供电
【单选题】
在发动机运转的过程中，如果发现驾驶舱头顶35VUELEC面板的IDG按压电门上的“FAULT”标示燃亮，这表示什么情况，因如何处理？___
A. 相应的IDG发生故障，应当立即按压电门脱开IDG
B. 相应的IDG发生故障，不需要立即采取行动
C. 相应的GCU发生故障，应立即按压电门脱开IDG
D. 相应的GCU发生故障，但系统会进行自动保护
【单选题】
当ACESSFEED电门放备用位时ACESSBUS是由哪里提供电源的：___
A. A.ACBUS1
B. B.ACBUS2
C. C.EmergencyGenerator
D. D.DCBATBUS
【单选题】
在下列哪种情况下静变流机将工作：___
A. A.当一台发动机的电源失效时。
B. B.只有电瓶供电时。
C. C.在飞机正常接通电源的情况下，静变流机一直工作。
D. D.用APU供电时。
【单选题】
在正常情况下ACESSBUS是由哪里提供电源的：___
A. A.ACBUS1
B. B.ACBUS2
C. C.EmergencyGenerator
D. D.DCESSBUS
【单选题】
电源系统中，DCBATBUS可能从哪些汇流条获得电源？___
A. 电瓶
B. DCBUS1或电瓶
C. DCBUS2或电瓶
D. DCBUS1、DCBUS2、电瓶
【单选题】
关于厨房卸载的说法正确的是：___
A. 当只有一台发电机工作的情况下，厨房大部分电源将被自动卸载
B. 如果由地面电源或APU发电机向飞机提供电源，厨房电源不会发生自动卸的情况
C. 当脱开驾驶舱头顶板电源面板上的“GALLEY”（部分构型为：GALY&CAB）后，厨房电源将被全部卸载
D. A、B、C均正确
【单选题】
驾驶舱头顶板中的35VUELEC面板“ACESSFEED”按钮电门上的“FAULT”标示燃亮，这表示：___
A. ACBUS1电源丢失
B. ACBUS2电源丢失
C. ACESS汇流条控制系统存在故障
D. ACESS汇流条没有电源供应
【单选题】
由于电源隔离原则，TR2不能够供电给：___
A. DCESSBUS
B. DCBUS2
C. DCSVCEBUS
D. BATBUS
【单选题】
在地面维护过程中，工作人员发现主发电机按钮电门上的“FAULT”灯会燃亮，这说明：1）相应发电机按钮电门被松开；2）电路中的GLC（发电机电路接触器）受到GCU控制而脱开IDG与电网的连接；3）系统探测到故障的发生，GCU控制GLC脱开IDG与电网的连接___
A. 1）、2）
B. 1）、3）
C. 2）、3）
D. 1）、2）、3）
【单选题】
958.(A320)A320在正常情况下ACBUS1向ACESSBUS及ACSHEDESSBUS提供电源。当飞机在失去ACBUS1和ACBUS2电源的紧急情况下，（——）将继续向ACESSBUS和ACSHEDESSBUS供电。___
A. 静变流自动工作
B. TR（变压整流器）将自动工作
C. 不论RAT状况如何，CSM/G（应急马达发电机）将自动工作
D. 当RAT提供的液压动力可用的情况下，CSM/G（应急马达发电机）将自动工作
【单选题】
959.(A320)DCBATBUS可以由哪里给它提供电源：___
A. A.DCBUS1orDCBUS2
B. B.DCBUS1orbattries
C. C.DCBUS2orbatteries
D. D.DCBUS1orDCBUS2orbatteries
【单选题】
RAT什么时候可以被放下?___
A. A.在地面上
B. B.在地面和在空中
C. C.在空中.
D.
【单选题】
哪种情况下冲压雪气涡轮不会放出:___
A. A.按压应急电源面板上MANON电门
B. B.按压液压面板上RATMAN0N电门
C. C.宅中ACBUSl和2断电,V>lookTS
D. D.地面按压EMERGENTEST电门
【单选题】
在空中正常供电构型下,以下说法不正确的是:___
A. A．ACESSBUS由ACBUS1供电
B. B．DCESSBUS由DCBATBUS供电
C. C．DCBATBUS由BAT1和BAT2供电
D. D．ACFLTGND由ACBUS2供电
【单选题】
厕所门怎样打开（）___
A. 可以从里面打开
B. 可以从外面打开
C. 只能从里面打开，不能从外面打开
D. A+B
【单选题】
对货舱的检查，维护人员主要做什么工作（）___
A. 检查货舱门
B. 检查货舱内部
C. 清除腐蚀污染物
D. 以上都对
【单选题】
飞机哪些系统与厕所相连（）___
A. 电源系统
B. 空调系统
C. 水/污水系统
D. 以上都对
【单选题】
机上设备和设施可以分为哪些（）___
A. 必备设备
B. 应急设备
C. 灭火设备
D. A+B
【单选题】
客舱面板哪些可以拆卸（）___
A. 上侧壁板
B. 下侧壁板
C. 天花板
D. 所有的面板
推荐试题
【简答题】
They say that pride comes before a fall. In the case of both Napoleon and Hitler, the many victories they enjoyed led them to believe that anything was possible, that nothing could stand in their way. Russia's icy defender was to prove them wrong.
【简答题】
In 1812, Napoleon Bonaparte, Emperor of the French, led his Grand Army into Russia. He was prepared for the fierce resistance of the Russian people defending their homeland. He was prepared for the long march across Russian soil to Moscow, the capital city. But he was not prepared for the devastating enemy that met him in Moscow -- the raw, bitter, bleak Russian winter.
【简答题】
In 1941, Adolf Hitler, leader of Nazi Germany, launched an attack against the Soviet Union, as Russia then was called. Hitler's military might was unequaled. His war machine had mowed down resistance in most of Europe. Hitler expected a short campaign but, like Napoleon before him, was taught a painful lesson. The Russian winter again came to the aid of the Soviet soldiers.
【简答题】
In the spring of 1812, Napoleon assembled an army of six hundred thousand men on the borders of Russia. The soldiers were well trained, efficient, and well equipped. This military force was called the Grand Army. Napoleon, confident of a quick victory, predicted the conquest of Russia in five weeks.
【简答题】
Shortly afterwards, Napoleon's army crossed the Neman River into Russia. The quick, decisive victory that Napoleon expected never happened. To his surprise, the Russians refused to stand and fight. Instead, they retreated eastward, burning their crops and homes as they went. The Grand Army followed, but its advance march soon became bogged down by slow-moving supply lines.
【简答题】
In August, the French and Russian armies engaged at Smolensk, in a battle that left over ten thousand dead on each side. Yet, the Russians were again able to retreat farther into Russian territory. Napoleon had won no decisive victory. He was now faced with a crucial decision. Should he continue to pursue the Russian army? Or should he keep his army in Smolensk for the approaching winter?
【简答题】
Napoleon took the gamble of pressing on to Moscow, 448 kilometers away. On September 7, 1812, the French and Russian armies met in fierce battle at Borodino, 112 kilometers west of Moscow. By nightfall, thirty thousand French and forty-four thousand Russians lay dead or wounded on the battlefield.
【简答题】
Again, the Russian army retreated to safety. Napoleon had a clear path to Moscow, but the occupation of the city became an empty victory. The Russians fled their capital. Soon after the French arrived, a raging fire destroyed two-thirds of the city. Napoleon offered a truce to Alexander I, but the Russian czar knew he could bide his time: "We shall let the Russian winter fight the war for us."
【简答题】
Napoleon soon realized he could not feed, clothe, and quarter his army in Moscow during the winter. In October 1812, he ordered his Grand Army to retreat from Moscow.
【简答题】
The French retreat turned into a nightmare. From fields and forests, the Russians launched hit-and-run attacks on the French. A short distance from Moscow, the temperature had already dropped to minus 4 degrees Celsius. On November 3, the winter's first snow came. Exhausted horses fell dead in their tracks. Cannon became stuck in the snow. Equipment had to be burned for fuel. Soldiers took ill and froze to death. The French soldiers dragged on, leaving the dead along every mile.
【简答题】
As the Russian army was gathering its strength, the French had to flee Russia to avoid certain defeat. At the Berezina River, the Russians nearly trapped the retreating French by burning the bridges over the swollen river. But Napoleon, by a stroke of luck, was able to build two new bridges. Thousands of French soldiers escaped, but at the cost of fifty thousand dead. Once across the Berezina, the tattered survivors limped toward Vilna.
【简答题】
Of the six hundred thousand soldiers Napoleon had led into Russia, less than one hundred thousand came back. The weakened French army continued its retreat westward across Europe. Soon, Britain, Austria, Russia, and Prussia formed a powerful alliance and attacked these stragglers. In March 1814, Paris was captured. Napoleon abdicated and went into exile, his empire at an end.
【简答题】
By early 1941, Adolf Hitler, leader of Nazi Germany, had seized control of most of Europe. To the east of Hitler's German empire was the Soviet Union. On June 22, 1941, without a declaration of war, Hitler began an invasion of the Soviet Union that was the largest military land campaign in history. Confident of a quick victory, Hitler expected the campaign to last no longer than three months. He planned to use the blitzkrieg, or "lightning war," tactics that had defeated the rest of Europe. The invasion had three broad thrusts: against Leningrad and Moscow and through the Ukraine.
【简答题】
Caught off guard by the invasion, Soviet leader Joseph Stalin instructed the Russian people to "scorch the earth" in front of the German invaders. Farms and factories were burned, destroyed, or rendered useless. During the first ten weeks of the invasion, the Germans pushed the front eastward, and the Russians suffered more than a million casualties.
【简答题】
In the north, the Germans closed in on Leningrad. Despite great suffering, however, the people of Leningrad refused to surrender. As the battle of Leningrad dragged on into winter, the city's situation became desperate. As food ran out, people died from hunger and disease. By the middle of the winter of 1941-1942, nearly four thousand people starved to death every day. Close to one million people died as a result of the siege.
【简答题】
In the center of Russia, Hitler's goal was the capture of Moscow. Because the Germans had anticipated a quick victory, they had made no plans for winter supplies. October arrived with heavy rains. "General Mud" slowed down the movement of the Germans' lightning attack.
【简答题】
As Hitler's armies drew closer and closer to Moscow, an early, severe winter settled over the Soviet Union, the harshest in years. Temperatures dropped to minus 48 degrees Celsius. Heavy snows fell. The German soldiers, completely unprepared for the Russian winter, froze in their light summer uniforms. The German tanks lay buried in the heavy snowbanks. The Russian winter brought the German offensive to a halt.
【简答题】
By the summer of 1942, Hitler had launched two new offensives. In the south, the Germans captured Sevastopol. Hitler then pushed east to Stalingrad, a great industrial city that stretched for 48 kilometers along the Volga River. Despite great suffering, Soviet defenders refused to give up Stalingrad.
【简答题】
In November 1942, the Russians launched a counterattack. With little or no shelter from the winter cold in and around Stalingrad, German troops were further weakened by a lack of food and supplies. Not until January 1943 did the Germans give up their siege. Of the three hundred thousand Germans attacking Stalingrad, only ninety thousand starving soldiers were left. The loss of the battle for Stalingrad finally turned the tide against Hitler. The German victories were over, thanks in part to the Russian winter.
【简答题】
During 1943 and 1944, the Soviet armies pushed the German front back toward the west. In the north, the Red Army broke the three-year siege of Leningrad with a surprise attack on January 15, 1944. Within two weeks, the heroic survivors of Leningrad saw their invaders depart. By March 1944, the Ukraine farming region was again in Soviet hands. On May 9, 1944, Sevastopol was liberated from the Germans. The Russians were now heading for Berlin.
【简答题】
For Hitler, the invasion of the Soviet Union had turned into a military disaster. For the Russian people, it brought unspeakable suffering. The total Soviet dead in World War II reached almost 23 million.
【简答题】
The elements of nature must be reckoned with in any military campaign. Napoleon and Hitler both underestimated the severity of the Russian winter. Snow, ice, and freezing temperatures took their toll on both invading armies. For the Russian people, the winter was an icy defender.
【单选题】
________不属于鼠类及体表寄生虫携带的病原体。___
A. 鼠疫耶尔森菌
B. 汉坦病毒
C. 黄病毒属病毒
D. 致病性钩端螺旋体
【单选题】
病媒生物死体样本运送，如果在24h内不能到达实验室的，运送过程中箱内温度应保持在_____。___
A. 4℃以下
B. 0℃以下
C. -20℃以下
D. 4℃以上
【单选题】
病媒生物死体样本运送，如果在装箱后4h内能够到达实验室的，运送过程中箱内温度应保持在______。___
A. 4℃以下
B. 0℃以下
C. -20℃以下
D. 4℃以上
【单选题】
病媒生物的死体样本运送，如果4h-24h内能到达实验室的，应将样品置于-30℃冷冻后再送样，运送过程中箱内温度应保持在________。___
A. 4℃以下
B. 0℃以下
C. -20℃以下
D. 4℃以上
【单选题】
恰加斯病也称为美洲锥虫病，其重要的传播媒介是________。___
A. 采采蝇
B. 厩螫蝇
C. 锥蝽
D. 埃及伊蚊
【单选题】
_______是黑热病内脏利什曼病的主要传播媒介。___
【单选题】
对于用作虫媒病毒分离或检测的蚊类标本，现场采集后应采用_______方式处置和运送。___
A. 杀虫剂熏杀+常温运输
B. 等蚊虫自然死亡+常温运输
C. 冷冻处死+常温运输
D. 冷冻处死+冷冻状态运输
【单选题】
_______不适用于入出境集装箱携带蝇、蚊、蠓的采集。___
A. 挥网法
B. 电动吸蚊器法
C. 直接捡取法
D. 二氧化碳诱蚊灯法
【单选题】
入境航空器应在______开始病媒生物监测。___
A. 卸货完成后
B. 抵达后
C. 等航空公司通知
D. 发现病媒生物时
【单选题】
进行集装箱携带输入性病媒生物监测时应准备的个人防护用品包括______。___
A. 乳胶手套、防护服
B. 防毒面具
C. 自给式呼吸器
D. 化学防护服
【单选题】
若要对采集到的输入性鼠类进行携带的病毒进行检测，取得其内脏器官的保存温度是_____。___
A. -80℃或以下
B. 0℃
C. 常温
D. 4℃-8℃
【单选题】
截获输入性活鼠或来自鼠疫流行区死鼠及经总署专家组确认和复核属于全国口岸首次截获的病媒生物应在______报告总署。___
A. 2小时之内
B. 8小时之内
C. 12小时之内
D. 24小时之内
【单选题】
入境船舶的蚊类和蝇类等双翅目病媒生物监测调查应白天在检疫锚地停泊期间进行，锚位距陆地距离不少于______，或在船舶靠泊后_____内进行。___
A. 1000 m；1h
B. 800 m、2 h
C. 400 m、4 h
D. 100 m、24 h
【单选题】
开展入境船舶输入性病媒生物监测工作中，在采集并保存病媒生物时由________陪同人员确认。___
A. 旅行社
B. 船方
C. 代理公司
D. 海事部门
【单选题】
在国境口岸或者交通工具上发现______有反常死亡或者死因不明的，国境口岸有关单位或者交通工具的负责人，必须立即向卫生检疫机关报告，迅速查明原因，实施卫生处理。___
【单选题】
采用鼠夹法监测鼠密度，应连续布放______。___
【单选题】
______不属于口岸区域鼠类常用监测方法。___
A. 鼠笼法
B. 鼠夹法
C. 目测法
D. 粉迹法
【单选题】
采用粉迹法监测鼠类密度时，滑石粉块的尺寸是______。___
A. 20cm×20cm
B. 30cm×30cm
C. 40cm×40cm
D. 50cm×50cm
