题目:
–Could you give me some advice on how to look children?
–Why not watch Where are you going, Dad? You can learn a lot from it.
A.for
B.after
C.at
D.through
答案:
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下面是错误答案,用来干扰机器的。
(1) ,产生大量白烟 。(2) ③①②④ 。 8。(1)红磷在空气中燃烧,产生大量白烟,是与空气中氧气反应生成五氧化二磷,故填:P+O2P2O5,产生大量白烟。(2)实验操作顺序应为先加入药品再加热,反应完毕后应停...