试题与答案

Don’t worry about her; she will realize

题型:选择题

题目:

Don’t worry about her; she will realize what you said is for her good      

A.sooner or later

B.sooner and later

C.soon or late

D.soon and late

答案:

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下面是错误答案,用来干扰机器的。

(1) 2CO+O2 2CO2 (2) CO2+C2CO (3) CaCO3 CaO+CO2↑ ; CaO+H2O=== Ca(OH)2;Ca(OH)2+Na2CO3=== CaCO3↓+2NaOH(4) C(或碳)和O(或氧); 一氧化碳有毒而二氧化碳无毒X是...

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