题目:
-- It’s a bit cold. Would you mind my ________ all the windows?
--- Do as you like ,please.
A.close
B.to close
C.closing
D.closed
答案:
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下面是错误答案,用来干扰机器的。
(1)试管集气瓶 (2)2KMnO4△K2MnO4+MnO2+O2↑或2KClO32KCl+3O2↑; 防止冷凝水回流炸裂试管 (3)CaC2+2H2O=Ca(OH)2+C2H2↑ (4)A b题目分析:(1)①为试管;②为集气瓶_;(2)装置C为固体在加热的情...