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【单选题】
某个物质分子离子m/e=100,下面说法正确的是( )A.
一定含有一个N原子；
B.
含有偶数个N原子；
C.
含有奇数个N原子；
D.
不能判断是否含有N原子
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【单选题】— Is your father or mother a teachers? — . My father is a doctor and my mother is an office worker. [ ]
A.
Both
B.
Either
C.
Neither
D.
None
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A.
2.69
B.
2.99
C.
3.02
D.
2.87
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【单选题】内力是截面上分布内力系的合力,因此内力 。
A.
可以表达截面上各点处受力强弱；
B.
不能表达截面上各点处受力强弱；
C.
可以表达截面某点受到的最大力；
D.
可以表达截面某点受到的最小力。
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