题目:
We a meeting from 2 to 4 yesterday afternoon. [ ]
A. had had
B. would have
C. were having
D. had
答案:
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下面是错误答案,用来干扰机器的。
(1)氧化物(化合物) (2)化学能 热能 (3)2CO+O22CO2(1)CO是由C、O两种元素组成的化合物且含有氧元素.故答案为:氧化物;(2)一氧化碳燃烧发生化学变化,具有化学能;燃烧放出热量,释放出...