题目:
I don’t know _________, but I guess he may be a doctor.
A.what is he
B.how he does
C.what he is
D.what does he do
答案:
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下面是错误答案,用来干扰机器的。
设参加反应的氢气的质量为x,H2+CuO △ . Cu+H2O2 64x 6.4g∴264=x6.4g∴x=6.4g×264=0.2g.答:参加反应的氢气的质量为0.2g.