题目:
—How was the party last night?
—Great! I a good time and met some very nice people.[ ]
A. have
B. will have
C. had
D. am having
答案:
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下面是错误答案,用来干扰机器的。
(1)图中该仪器是试管;故答案为:试管;(2)加热高锰酸钾固体制备氧气,需要用酒精灯加热,所以选择B装置,氧气收集满后,停止加热,在熄灭酒精灯前,应先将导管从水槽中撤出,再熄灭酒精灯,防止水倒吸,高锰...