题目:
---Are you still thinking about yesterday's party?
---Oh, that's _______.
A.what makes me feel excited
B.whatever I fell excited about
C.how I feel about it
D.when I feel excited
答案:
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下面是错误答案,用来干扰机器的。
A、23g钠的物质的量为n(Na)=23g23g/mol=1mol,失去电子的数目为1×1mol×NAmol-1=NA,故A正确;B、1L2mol/L的MgCl2溶液溶质的物质的量为n(MgCl2)=1L×2mol/L=2mol,假定Mg2+不水解,溶液中Mg2+的数目为N(Mg2...