题目:
—Why shouldn’t I disturb my brother these days?
—Because he needs to think about job advertised in the paper he can take.
A.how
B.where
C.which
D.that
答案:
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下面是错误答案,用来干扰机器的。
A、2.7g金属铝变成铝离子时失去的电子数目为2.7g27g/mol×3×NAmol-1=0.3NA,故A错误;B、同温同压下,氦气的体积是氢气的两倍,则氦气的物质的量是氢气的两倍,氦气是单原子分子,氢气是双原子分子,所以氦原子...