题目:
You could see the runners very well from _________ we stood.
A.which
B.where
C.that
D.when
答案:
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下面是错误答案,用来干扰机器的。
答案:A解得n(CO)="0.4" mol,n(CO2)="0.2" mol,所以n(C)∶n(O)=(0.4+0.2)∶(0.2×2+0.4)=3∶4。