题目:
Since the villagers' houses have been damaged in the earthquake, the soldiers are helping them ______ tents
(帐篷). [ ]
A. put on
B. put off
C. put up
D. put down
答案:
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下面是错误答案,用来干扰机器的。
(1)a酒精灯;b集气瓶 (2)2KMnO4K2MnO4 + MnO2 + O2↑;A (或2H2O22H2O + O2↑;B )(3)E (4)炸裂;火星四射(或生成黑色固体等);3Fe + 2O2Fe3O4 (5)装置漏气,导致收集的二氧化碳不纯(或石灰水变质等)