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【单选题】
装、拆接地线必须由___ 完成。
A. 一人
B. 两人
C. 三人
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B
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【单选题】
在 ___ 中,电动势、电压、电流的大小和方向随时间按正弦规律变化。
A. 直流电路
B. 正弦交流电路
C. 脉冲电路
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在感性负载交流电路中,采用 ___ 的方法可提高电路功率因数。
A. 串联电阻
B. 并联电容
C. 串联电容
【单选题】
流过导体单位截面积的电流叫电流密度,其单位为 ___ 。
A. 安培
B. 安培/ 平方米
C. 安培/ 平方毫米
【单选题】
电气设备有三种工作状态,即运行、 ___ 、检修状态。
A. 热备用
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【单选题】
手车式开关柜,小车已推入 ,开关合入 ,称之为 ___ 。
A. 运行状态
B. 备用状态
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变压器可以在绝缘及寿命不受影响的前提下,在负载高峰及冬季时可___ 过负载运行。
A. 严重
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【单选题】
关于 380/220V 市电系统 ,___ 说法是正确的。
A. 220V 是相电压 ,380V 是线电压
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通电直导体在磁场中所受力的大小,与其通过的电流___ 。
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【单选题】
在 ___ 中,电动势、电压、电流的大小和方向都不随时间的改变而变化。
A. 直流电路
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规定在磁体外部,磁力线的方向是___ 。
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避雷线在防雷保护中所起的作用是___。
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运行值班人员在室外进行巡回检查,如高压设备发生接地时,不得接近故障点___ 以内。
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【单选题】
电气设备由一种工作状态转换到另一种工作状态,或改变电气一次系统运行方式所进行的操作称为___ 。
A. 调度操作
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【单选题】
高压熔断器可用于___ 等设备的保护。
A. 电压互感器
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负荷开关与熔断器配合使用时,由熔断器起 ___ 作用。
A. 切断正常负荷电流
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___ 指正常情况下没有断开的备用电源或备用设备,而是工作在分段母线状态,靠分段断路器取得相互备用。
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下列 ___ 表示 I 段电压小母线A 相。
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作用于人体的电压升高,人体电阻还会 ___, 致使电流更大,对人体的伤害更严重。
A. 下降
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【单选题】
人体触电可分为直接接触触电和___两大类。
A. 跨步电压触电
B. 接触电压触电
C. 间接接触触电
【单选题】
当人体电阻一定时,作用于人体的电压越高,流过人体的电流___ 。
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人体触电后能够自主摆脱的电流称为___。
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额定容量是指:在变压器铭牌所规定的额定状态下,变压器二次侧的输出能力___ 。
A. kV
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变压器 ___通常分为无励磁调压和有载调压两种方式。
A. 运行方式
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根据变压器的工作原理,常采用改变变压器___ 的办法即可达到调压的目的。
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12m 电杆埋设深度宜___。
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电力线路按架设方式可分为___ 。
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供电质量指 ___ 与供电可靠性。
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三相系统中发生的短路有4 种基本类型 ,三相短路、 ___、单相接地短路和两相接地短路。
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电路处于断路状态时,电路中没有 ___ 流过。
A. 电压
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已知一部分电路的端电压为10V,电阻为 5?,则电流的电流为___A 。
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在纯电阻电路中,电流和电压 ___ 。
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在实际应用中,常用 ___定为设备的额定容量,并标在铭牌上。
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在三相交流电路中,负载消耗的总有功功率等于___ 。
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B. 各相有功功率之和
C. 各相视在功率之差
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同性磁极相互___ 。
A. 吸引
B. 排斥
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全电路欧姆定律表明,在闭合回路中,电流的大小与电源电动势___, 与整个电路的电阻成反比。
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下列关于保护变压器的角型间隙安装位置描述正确的是___ 。
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金属氧化锌避雷器特点有动作迅速、___ 、残压低、通流量大。
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线路验电应逐相进行。同杆架设的多层电力线路验电时,先验低压后验高压、___。
A. 先验上层后验下层
B. 验下层
C. 先验下层后验上层
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如果在交接班过程中,有异常情况要处理,仍由 ___ 负责处理 ,必要时可请接班人员协助工作。
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RN2 型高压熔断器可适用于作___的保护。
A. 变压器
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17. —Oh.I’m hungry.Mum, can I have the hamburger on the plate? —No.It tastes . A. terribly B. terrible C. good D. well
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18. —We can invite our teachers to the farewell party next Saturday. —Yes, ______? I’ll call them at once. A. what for B. what C. why not D. why
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【单选题】
19.You can ________ ask the old man to move away to any other place because he has lived ________ here for at least sixty years. A. hardly; alone B. hard; alone C. hardly; lonely D. hardly; lonely
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20.—I’m going back to see my grandparents this weekend. —________. A. It’s very nice of you B. You’d better hurry C. Say goodbye to them D. Give my best wishes to them
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【单选题】
21.—Why not take ____ umbrella with the sign “Made in China”? It is useful. —What _______ good advice it is!    A. an; a B. a; a C. an; \ D. \; a
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B. B
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【单选题】
22. —Do you know the boy________ is sitting next to Peter? — Yes. He is Peter’s friend. They are celebrating his ________ birthday. A. who; ninth B. that; ninth C. /; ninth D. which; ninth
A. A
B. B
C. C
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【单选题】
23. It was dark, ______ I couldnt see what was happening. A. or B. though C. but D. so
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B. B
C. C
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24.—You can use MSN to talk with Vivien on the Internet. —I know. But can you tell me ________? A. what I can use it B. when I can use it C. why can I use it D. how can I use it
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C. C
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【单选题】
25. _______ are you going to the School Uniform Exhibition, Amy ? To learn about different styles of school uniform. A. What B. Where C. Which D. Why
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B. B
C. C
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【单选题】
( ) 26. Where does the writer of "The little Prince" come from? A.England. B.France. C.America. D.China.
A. A
B. B
C. C
D. D
【单选题】
( ) 27. What does the prince do after the fox tells him a secret? A.He cares more about a flower and a sheep. B.He meets many more strange adults on other planets. C.He realizes his love for the rose and he goes back to his planet.   D.He discovers interesting things such as a snake, other roses and a fox
A. A
B. B
C. C
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【单选题】
( ) 28. What does "The little Prince" mainly talk about? It' s about _________. A.the adult world B.the planet B -612 C.a rose and a fox D.the adventure of a young prince
A. A
B. B
C. C
D. D
【单选题】
( ) 29. What is the writer's main purpose(目的)in writing this passage?    A.To tell the readers his life story.    B.To tell people what kind of person his father was.    C.To tell the readers what present he got from his father.    D. To let people know how poor he was.
A. A
B. B
C. C
D. D
【单选题】
( ) 30. Why did the father not ask his son not to do this and do that?    A.Because he felt quite confident of his son.    B.Because he was born from a poor family.    C.Because he was a man of few words.    D.Because he didn't want to be much too strict with his son.
A. A
B. B
C. C
D. D
【单选题】
( ) 31. What would someone learn from this passage?    A.How to live by oneself. B.How to stand on one's own feet.    C.What a good father should do. D.What the self-important is like.
A. A
B. B
C. C
D. D
【单选题】
( ) 32. 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
A. A
B. B
C. C
D. D
【单选题】
( ) 33. Why did Natalie Smith pay for the six cars behind her? A. She had seven tickets. B. She hoped to please others. C. She knew the car drivers well. D. She wanted to show kindness.
A. A
B. B
C. C
D. D
【单选题】
( ) 34. Judy Foreman copied down the phrase because she ___ . A. thought it was beautifully written B. wanted to know what it really meant C. decided to write it on a warehouse wall D. wanted her husband to put it up in the classroom
A. A
B. B
C. C
D. D
【单选题】
( ) 35. Who came up with the phrase according to the passage? A. Judy Foreman. B. Natalie Smith. C. Anne Herbert D. Alice Johnson.
A. A
B. B
C. C
D. S
【单选题】
( ) 36. What can we infer from the last paragraph? A. People should practice random kindness to those in need. B. People who receive kindness are likely to offer it to others. C. People should practice random kindness to strangers they meet. D. People who receive kindness are likely to pay it back to the giver.
A. A
B. B
C. C
D. D
【单选题】
( ) 37.The greatest river for navigation is ___________. A. the Nile B. the Amazon C. the Mekong D. the Mississippi
A. A
B. B
C. C
D. D
【单选题】
( ) 38. From a dam, people can use the water for ___________. A. keeping the rivers clean B. only making electricity C. irrigation and making electricity D. washing clothes
A. A
B. B
C. C
D. D
【单选题】
( ) 39. The water in the river is polluted because of _____________. A. people's drinking water too much B. people's swimming in the river too much C. chemicals and other materials D. people's building a dam across a river
A. A
B. B
C. C
D. D
【单选题】
( ) 40. The best title of the passage is ___________. A. Rivers in Cities B. The importance of Rivers C. Transportation D. Natural Resources
A. A
B. B
C. C
D. D
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