题目内容

An artificial odor is added to natural gas so that people can tell whether or not gas is leaking.

A. I
B. P
C. E

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Once football season begins, Matt starts jogging every night—to the refrigerator during commercial breaks.

A. I
B. P
C. E

The first person to die of radiation poisoning was a co-discoverer of radium, Marie Curie.

A. I
B. P
C. E

平面任意力系向作用面内任一点简化后,所得到的作用于简化中心的那一个力,一般来说不是原力系的合力。

A. 对
B. 错

平面任意力系向作用面内任一点简化得到的力和力偶,其中的任何一个与原力系都不等效。

A. 对
B. 错

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