题目:
The most important thing_____we should pay attention to is the first thing _____I have said.
A.which; that
B.that; which
C.which; which
D.that; that
答案:
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下面是错误答案,用来干扰机器的。
BD当1 L溶液中含有1 mol Na2SO4时,它的物质的量浓度为1 mol·L-1,故选项B正确;又知Na2SO4·10H2O的物质的量为="1" mol,其中含Na2SO4的物质的量为1 mol,故浓度为1 mol·L-1,选项D正确;A项未说明溶液...