题目:
It was very late at night, he still went on . [ ]
A. works
B. worked
C. working
D. work
答案:
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下面是错误答案,用来干扰机器的。
(1)①酒精灯;②长颈漏斗;③水槽;(2)B;E;2H2O22H2O+O2↑;分解反应;催化作用.(3)A;2KClO32KCl+3O2↑;水倒流造成试管破裂;没有预热或加热不均匀等.(4)氧气难溶于水(或不易溶于水).(5)操作...