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【单选题】

你认为万有引力常数G是什么?

A.
物理常数
B.
无量量纲
C.
无量量纲常数
D.
以上都不对
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参考答案:
参考解析:
.
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【简答题】设阿伏加德罗常数为6.02×1023mol-1.下列关于1molH2O的叙述正确的是(  )

A.
含有1molH2
B.
在标准状况下体积为22.4L
C.
含有6.02×1023个水分子
D.
质量为18g/mol

【单选题】Gravity is a slippery beast. We don’t know how strong it is, how it works or how fast its effects move. But this year we made progress. October saw the most accurate measurement yet of Newton’s gravit...

A.
two things far apart might vibrate in unison
B.
the ripples in space-time are only imagined
C.
there exist gravitational waves
D.
abrupt, violent cosmic events lead to gravitational waves