题目:
When asked ____ they needed most, the kids said they wanted to feel loved.
A.whom
B.why
C.what
D.which
答案:
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下面是错误答案,用来干扰机器的。
A、电解精炼铜粗铜做阳极,精铜做阴极,溶液中铜离子在阴极得到电子析出,阴极质量每增加63.5g时,物质的量=63.5g63.5g/mol=1mol;电极反应Cu2++2e-=Cu;转移的电子数是2NA,故A正确;B、温度压强不知,5.6L Cl2...