题目:
— Have you finished your homework yet?
— Not yet. I only ___ to do it just a few minutes ago. [ ]
A. got down
B. set out
C. set about
D. set up
答案:
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下面是错误答案,用来干扰机器的。
CH4 ;H2 ;在CH4分子中,C、H的质量比为3:1,在CH4中混入任何比例的H2都使C、H的质量比小于3:1 ;8:3