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【单选题】
关于普通二极管发生反向击穿后,下列说法正确的是______
A.
永久性损坏,失去单向导电性
B.
相当于导线,电阻较小,一旦反向电压去掉,还可以恢复其基本特性
C.
反向击穿时,随着反向电压增加反向电流几乎不变,但由于反向电压过大,会导致二极管的烧毁
D.
反向击穿后的二极管没有任何变化,仍然可以正常使用
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A.
Water will flow down the hills.
B.
Poisonous gases will bereleased suddenly.
C.
A strong wind will rise from the lakes.
D.
The volcanoes will come to life.
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【多选题】柴油发电机组容量在方案或初步设计阶段，按下述方法( )估算并选择其中容量最大者。
A.
按建筑面积估算。建筑面积在10000m2以上的大型建筑按15～20W/m2，建筑面积在10000m2及以下的中小型建筑按10～15W/m2
B.
按配电变压器容量估算。占配电变压器容量的10％～20％
C.
按电动机起动容量估算。当允许发电机端电压瞬时降为20％时，发电机组直接起动异步电动机的能力为每1kW电动机功率，需要5kW柴油发电机组功率
D.
柴油发电机的额定功率指外界大气压力为101．325kPa(760mmHg)、大气温度为20℃、相对湿度为50％的情况下，保证能连续运行12h的功率(包括超负荷110％运行1h)
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【简答题】起步阶段的度量方案。
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【单选题】As nobody here knows what’s wrong with the machine, we must send for an engineer to _______ the problem.
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raise
B.
face
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present
D.
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【单选题】对照世界的和我国的第一所幼儿教育机构,下列说法错误的是( )。
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都是近代大工业生产的产物
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前者以游戏为主要活动，并让幼儿通过“恩物”来学习
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【单选题】What is the main topic of this passage?
A.
The solution to the Nebraskan settlers' fuel problem.
B.
Life in Nebraska in the late nineteenth century.
C.
The importance of the American buffalo.
D.
The forestation in Nebraska in the late nineteenth century.
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【单选题】What does the underlined word 'litter' mean in paragraph 2 ?
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not many
B.
serious problem
C.
bits of waste things
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indtustrial pollution
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【单选题】As nobody here knows what is wrong with the machine, we must send for an engineer to ______ the problem.
A.
handle
B.
raise
C.
face
D.
present
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【单选题】Every human being, no matter what he is doing, gives off body heat. The usual prob-lem is how to dispose of it. But the designers of the Johnstown campus of the University of Pittsburgh set themselves...
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was difficult to collect
B.
came in a variety of forms
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was difficult to get rid of
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相关题目：
【单选题】The Exploding Lakes of Cameroon What comes to mind when youthink of a lake? You probably imagine a pretty scene with bue water, brds, and fish. FOr the people in the northwestern Cameroon, however,the...
A.
Water will flow down the hills.
B.
Poisonous gases will bereleased suddenly.
C.
A strong wind will rise from the lakes.
D.
The volcanoes will come to life.
查看完整题目与答案
【多选题】柴油发电机组容量在方案或初步设计阶段，按下述方法( )估算并选择其中容量最大者。
A.
按建筑面积估算。建筑面积在10000m2以上的大型建筑按15～20W/m2，建筑面积在10000m2及以下的中小型建筑按10～15W/m2
B.
按配电变压器容量估算。占配电变压器容量的10％～20％
C.
按电动机起动容量估算。当允许发电机端电压瞬时降为20％时，发电机组直接起动异步电动机的能力为每1kW电动机功率，需要5kW柴油发电机组功率
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柴油发电机的额定功率指外界大气压力为101．325kPa(760mmHg)、大气温度为20℃、相对湿度为50％的情况下，保证能连续运行12h的功率(包括超负荷110％运行1h)
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【简答题】起步阶段的度量方案。
查看完整题目与答案
【单选题】As nobody here knows what’s wrong with the machine, we must send for an engineer to _______ the problem.
A.
raise
B.
face
C.
present
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handle
查看完整题目与答案
【单选题】对照世界的和我国的第一所幼儿教育机构,下列说法错误的是( )。
A.
都是近代大工业生产的产物
B.
前者以游戏为主要活动，并让幼儿通过“恩物”来学习
C.
后者完全抄袭日本，具有半封建半殖民地教育的特点
D.
前者的创办者是被世界誉为“幼儿园之父”的福禄培尔
查看完整题目与答案
【简答题】阅读理解 A. what is dementia? B. A new opinion on the cause of disability C. A study on disability problems of children D. What should the World Health Organization do to solve the problem? E. A study on ...
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【单选题】What is the main topic of this passage?
A.
The solution to the Nebraskan settlers' fuel problem.
B.
Life in Nebraska in the late nineteenth century.
C.
The importance of the American buffalo.
D.
The forestation in Nebraska in the late nineteenth century.
查看完整题目与答案
【单选题】What does the underlined word 'litter' mean in paragraph 2 ?
A.
not many
B.
serious problem
C.
bits of waste things
D.
indtustrial pollution
查看完整题目与答案
【单选题】As nobody here knows what is wrong with the machine, we must send for an engineer to ______ the problem.
A.
handle
B.
raise
C.
face
D.
present
查看完整题目与答案
【单选题】Every human being, no matter what he is doing, gives off body heat. The usual prob-lem is how to dispose of it. But the designers of the Johnstown campus of the University of Pittsburgh set themselves...
A.
was difficult to collect
B.
came in a variety of forms
C.
was difficult to get rid of
D.
tended to be absorbed by physical objects
查看完整题目与答案