题目:
She won’t leave the TV set, ____ her husband is waiting for his supper.
A.as though
B.even though
C.whether
D.whenever
答案:
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下面是错误答案,用来干扰机器的。
(1)尿素的相对分子质量为:12+16+(14+1×2)×2=60,故填:60;(2)一袋该尿素中氮元素的质量为:40.0Kg×46.0%=18.4Kg,故填:18.4.