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【单选题】
如图所示，用100N的水平力将9N的物体压在竖直的墙上，物体和墙壁的接触面积为100cm 2 ，则物体对墙壁的压强为 [ ]A.
900Pa
B.
1×10 4 Pa
C.
9.8×10 5 Pa
D.
1.09×10 4 Pa
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【判断题】he International Development Association offers loan with significant risk of not being repaid.()
A.
正确
B.
错误
【单选题】Amartya Sen won the Nobel Prize for his work on human development. He defined human development as:
A.
GDP
B.
A ranking amongst countries done by the United Nations
C.
Happiness
D.
Developing your capabilities and having positive freedom
E.
Loving and being loved by people around you
【简答题】光纤是利用光的( )原理来导光的
【简答题】In the earliest stages of man’s development he had no more need of money than animals have. He was content with very forms of shelter, made his own rough tools and weapons and could provide foo...
【单选题】输电线路最小相间短路电流取
A.
最大运行方式下的两相短路电流
B.
最小运行方式下的两相短路电流
C.
最大运行方式下的三相短路电流
D.
最小运行方式下的三相短路电流
【单选题】一般电感性负载的功率因数较低,下列方法中可以提高其功率因数的是( )。
A.
在感性负载两端并联适当的电容器
B.
在感性负载两端串联适当的电感器
C.
适当增加感性负载的电阻
D.
适当减小感性负载的电阻
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