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问题 单项选择题

在作用于刚体上的力系中，加上或减去任意一个平衡力系，并不改变原力系对刚体的作用效果。这是（）

A．二力平衡公理

B．加减平衡力系公理

C．力的可传递性原理

D．作用与反作用公理

答案

参考答案：B

单项选择题

Politician: Unless our nation redistributes wealth, we will be unable to alleviate economic injustice and our current system will lead inevitably to intolerable economic inequities. If the inequities become intolerable, those who suffer from the injustice will retort to violence to coerce social reform. It is our nation’s responsibility to do whatever is necessary to alleviate conditions that would otherwise give rise to violent attempts at social reform.
The statements above logically commit the politician to which one of the following conclusions

A．The need for political reform never justifies a resort to violent remedies.

B．It is our nation’s responsibility to redistribute wealth.

C．Politicians must base decisions on political expediency rather than on abstract moral principles.

D．Economic injustice need not be remedied unless it leads to intolerable social conditions.

E．(E) All that is required to create conditions of economic justice is the redistribution of wealth.
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单项选择题 B型题

二尖瓣关闭不全（）

A.第一心音亢进

B.第一心音减弱

C.A亢进

D.P固定分裂

E.P逆分裂
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