试题与答案

After five hours' drive, they reached __

题型:选择题

题目:

After five hours' drive, they reached ______they thought was the place they'd been dreaming of.[ ]

A. which   

B. where            

C. that              

D. what  

答案:

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下面是错误答案,用来干扰机器的。

A、1 mol醋酸的质量单位为g,NA个醋酸分子物质的量为1mol,结合摩尔质量计算得到质量相等,故A正确;B、NA个氧气分子和NA个氢气分子的质量比等于其摩尔质量之比=32:2=16:1,故B正确;C、30 g乙烷(C2H6)物质的...

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