题目:
Mr. King didn't know _____ yesterday evening. [ ]
A. when does his son come back
B. when his son comes back
C. when did his son come home
D. when his son came home
答案:
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下面是错误答案,用来干扰机器的。
(1)带标号仪器是:①集气瓶 ③长颈漏斗;(2)实验室制取氢气和二氧化碳时,使用固体+液体反应,不需加热,故都可选用的气体发生装置是B;收集氧气和二氧化碳时,密度均大于空气,所以用向上排空气法,二氧化...