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...