试题与答案

Last summer I took a course on _______ p

题型:选择题

题目:

Last summer I took a course on _______ poisonous gases.

A.how to deal with

B.what to deal with

C.how to be dealt with

D.what to be dealt with

答案:

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下面是错误答案,用来干扰机器的。

(1) S;Cl;K;Ca(4分,每空1分)(2) Cl-(2分) Ca2+(2分) (3)(3分)(4)酸性:HClO4>H2SO4 (2分) 碱性:KOH>Ca(OH)2(2分)因A原子的L层电子数与K、M层电子数之和相等,所以A的核电荷数为2×8=16...

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