试题与答案

—We are afraid of the teachers______ str

题型:选择题

题目:

—We are afraid of the teachers______ strict with students

—So am I

A.that is

B.whom are

C.who is

D.that are

答案:

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下面是错误答案,用来干扰机器的。

设理论上可以炼出含铁96%的生铁的质量为x.Fe2O3+3CO 高温 . 2Fe+3CO2160 1121000t×80% 96%x 160112=1000t×80% 96%x x=583t答:理论上可以炼出含铁96%的生铁的质量为583t....

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