【单选题】
有两个调整压力分别为5MPa和10MPa的溢流阀串联在液压泵的出口，泵的出口压力为___。
A. 5Mpa
B. 10MPa
C. 15Mpa
D. 20MPa
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相关试题
【单选题】
通常齿轮泵的吸油管应比压油管___些。
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云梯消防车平台内的额定载荷一般为___。
A. 180kg
B. 800kg
C. 400kg
D. 100kg
【单选题】
下面那个因素不一定需要更换钢丝绳___。
A. 发现有断丝、断股情况
B. 钢丝绳脱节
C. 钢丝绳变形或腐蚀
D. 钢丝绳润滑不够
【单选题】
云梯消防车发动机保养间隔时间，可按 1小时约对应___的行驶里程掌握。
A. 30km
B. 90km
C. 60km
D. 120km
【单选题】
举高消防车每个支腿可承受整车重量的___。
A. 全部
B. 1/2
C. 1/3
D. 1/4
【单选题】
下面哪一个不是举高车水平支腿伸不出去的故障原因。___
A. 活动支腿与固定支腿之间装配间隙太小
B. 下车控制水平支腿的溢流阀设定压力太低。
C. 发动机转速过低
D. 控制水平支腿外伸的开关或电路出故障
【单选题】
___将油液的压力转换为机械能带动负载运动。
A. 液压泵
B. 液压缸
C. 压力阀
D. 方向阀
【单选题】
___时，液压系统不能稳定工作。
A. 高温
B. 低温
C. 常温
D. 高温或低温
【单选题】
举高车工作斗内电气操纵手柄不能对云梯进行___等操作。
【单选题】
与登高平台消防车相比，云梯消防车的优势主要有___。
A. 高度较高
B. 操作速度快
C. 工作半径大
D. 承载能力大
【单选题】
以下对举高类消防车描述正确的是___。
A. 云梯消防车只能用于救人
B. 举高车的臂架型式分为直臂和曲臂两种
C. 45米以上的举高车其行驶速度一般为80km/h左右
D. 软腿报警可作为衡量举高车安全系统性能标准之一
【单选题】
当云梯车在最大仰角并为最大伸长时，顶部___梯级上沿到地面的垂直距离，称为云梯车的额定工作高度。
【单选题】
当高喷车举升到最大高度时，处于水平状态的喷射炮___线到地面的垂直距离，称为高喷车的额定工作高度。
【单选题】
举高消防车稳定性测试时，试验场所的地面应平坦、坚硬，并有足够的空间供举高消防车展开及操作，在风速小于___m/s 的条件下进行试验。
【单选题】
举高消防车在支腿展开调平之前，臂架或梯架___启动。
A. 可以启动
B. 不能启动
C. 边展开边启动
D. 强行启动
【单选题】
登高平台消防车液压油油量，当整车处于行驶状态时，液压油油位应处于液位计的___。
A. 100以上和110之间
B. 90以上和110之间
C. 80以上和110之间
D. 100以上和120之间
【单选题】
工作平台和臂的任何部位都应远离障碍物和高压线，距变压输送线应大于___米。
【单选题】
下面液压元件是执行元件的是___
A. 变量泵
B. 油缸
C. 液压泵
D. 柱塞泵
【单选题】
下面哪一个不属于举高类消防车的分类___。
A. 登高平台消防车
B. 云梯消防车
C. 举高喷射消防车
D. 曲臂消防车
【单选题】
举高消防车的最大工作高度不应小于___。
A. 12米
B. 15米
C. 20米
D. 30米
【单选题】
轻型消防车消防车底盘的厂定最大总质量大于( )，但不大于___的消防车。
A. 1800kg;6000 kg
B. 2800 kg; 7000 kg
C. 1000 kg;5000 kg
D. 1000 kg; 6000 kg
【单选题】
举高消防车应配置与支腿数量相等的支承墊板，支 承墊板的面积应保证支撑面所受的压强小于等于 800KPa。每块支承墊板的重量不得大于 ___
A. 15kg
B. 20Kg
C. 18Kg
D. 14Kg
【单选题】
以下属于热爱本职、钻研技术的是___。
A. 干一行，爱一行，专一行，成一行
B. 适时更换新的工作
C. 会开车即可
D. 当一天和尚撞一天钟
【单选题】
有些驾驶员缺乏职业道德，不讲文明礼貌，只顾自己方便，不管他人难处，占道行驶，强行超车，车逼行人，导致种种交通事故的发生，这就要求正确处理___的关系。
A. 快与慢
B. 得与失
C. 有理与无理
D. 好与坏
【单选题】
测量时将百分表测头___抵住工件被测量面，使工件按一定要求移动或转动。
A. 随意
B. 垂直
C. 倾斜600角
D. 100N的压力
【单选题】
___是国际单位制中的基本量。
A. 长度、质量、时间
B. 重量
C. 转/分
D. 吨
【单选题】
我国车用汽油目前均根据___划分牌号。
A. 十六烷值
B. 蒸发性
C. 辛烷值
D. 安定性
【单选题】
汽车发动机用机油黏度级的选择主要考虑环境___。
A. 温度
B. 腐蚀性
C. 抗氧化性
D. 安定性
【单选题】
合成型制动液常用的有___等三种。
A. HZY2 HZY3 HZY4
B. 80W/90、85W/90、85W/140
C. SD、SC、SE
D. 5W/30、5W/40、10W/30
【单选题】
汽车前端突出点向前轮引的切线与地面的夹角称为___。
A. 接近角
B. 离去角
C. 前悬
D. 后悬
【单选题】
二冲程发动机曲轴转一周，活塞在气缸里往复行程二次，完成___个工作循环。
【单选题】
发动机活塞在下止点时，活塞顶上面整个空间的容积称___。
A. 汽缸总容积
B. 燃烧室容积
C. 汽缸工作容积
D. 汽缸的容积
【单选题】
发动机的曲轴正时齿轮与凸轮轴正时齿轮的传动比是___。
A. 1：1
B. 1：2
C. 2：1
D. 1.5：1
【单选题】
汽车发动机冷却系统中提高冷却液沸点的装置是 ___。
A. 水箱盖
B. 散热器
C. 水套
D. 水泵
【单选题】
汽车按驱动桥的多少可分为单桥驱动(4×2)、双桥驱动(4×4)和三桥驱动(6×60)，单桥驱动括号内数字2代表___。
A. 驱动轴数
B. 驱动轮总数
C. 总轮数
D. 总轴数
【单选题】
汽车用的减振器广泛采用的是___。
A. 单向作用筒式
B. 双向作用筒式
C. 摆臂式
D. 阻力可调式
【单选题】
转向盘在转向轮发生偏转前能转过一定的角度，这段角行程称为转向盘的自由行程。一般转向盘的自由行程为___。
A. 250
B. 100
C. 100～250
D. 00
【单选题】
电流通过负载时，将电场能转换成其他形式的能叫做___。
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25. — David, look at the man in white over there．Can you tell me _______ ?
—He is a doctor．
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( ) 26.With help from a Mr. H, you can__________.
A. stop wearing your watch B. get new books and objects
C. finish your homework on time D. know when parents or teachers are near
【单选题】
( ) 27. A PENGO WATCH CONTROL can help you to ______________.
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( ) 28. You can get your Mr. H for___________.
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( ) 29. When was canned food invented?
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( ) 30. After the trip to the Arctic, Clarence Birdseye invented ____________.
A. canned food B. can openers
C. frozen food D. air conditioning
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( ) 31. Changes in weather _____________ in Willis Carrier's company.
A. helped to keep food B. made rooms comfortable
C. caused health problems D. hurt printing paper
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( ) 32. According to the passage, which of the following may lead to inventions?
A. People's needs. B. Public support.
C. Modern technology. D. Practical suggestions.
【单选题】
( ) 33. What is the writer's main purpose（目的）in writing this passage？
A．To tell the readers his life story．
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D． To let people know how poor he was．
【单选题】
( ) 34. Why did the father not ask his son not to do this and do that？
A．Because he felt quite confident of his son．
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C．Because he was a man of few words．
D．Because he didn't want to be much too strict with his son．
【单选题】
( ) 35. What would someone learn from this passage？
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C．What a good father should do． D．What the self-important is like．
【单选题】
( ) 36. What may be the proper Chinese for the underlined part in the passage？
A．闲暇时光 B．学费 C．精神空虚 D．经济不足
【单选题】
( ) 37. The Chinese Yellow Sea Wetlands are in the _______ of China．
A．south B．east C．west D．north
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( ) 38. Usually the weather in the wetlands is _______．
A．hot B．pleasant C．cold D．dry
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( ) 39. The World Wetlands Day is on _______．
A．February 2 B．June 25 C．April 22 D．March
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( ) 40. We must protect wetlands because _______．
A．they are home for wildlife B．they can prevent flood
C．they can offer food to the animals and birds D．all of the above
【单选题】
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A. 20 minute’s walk B. 20 minutes walk
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He should be careful next time.
A. knocked off B. took off C. showed off D. turned off
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