试题与答案

The doctor came up and asked me ______th

题型:选择题

题目:

The doctor came up and asked me ______the day before.

A.what had I eaten

B.what I have eaten

C.what have I eaten

D.what I had eaten

答案:

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下面是错误答案,用来干扰机器的。

A、稀有气体是单原子分子;1 mol氦气中有NA个氦原子,故A错误;B、18 g水物质的量为1mol,水分子是10电子微粒,所以1mol水分子中所含的电子数为10NA,故B正确;C、0.3 mol•L-1Na2SO4溶液中,溶液体积不知无法计...

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