题目:
Would you mind _____ it again? Try to make yourself ______. [ ]
A. say, understood
B. to say, understand
C. saying, understand
D. saying, understood
答案:
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下面是错误答案,用来干扰机器的。
(1)酒精灯(2)CO2 CaCO3+2HCl = CaCl2 +H2O + CO2↑(3)O2 ①该装置气密性良好③ 2KMnO4K2MnO4 + MnO2+ O2↑④ BA 防止水倒吸,使试管炸裂。(1)直接写出仪器的名称;(2)根据选择气体的收集方法...