(1)①试管;②集气瓶;防止气体从长颈漏斗逸出;
(2)2KMnO 4
K 2MnO 4+MnO 2+O 2↑; B;导管移出水面; 熄灭酒精灯;
(3)CaCO 3+2HCl=CaCl 2+CO 2↑+H 2O;复分解反应; D; (4)C
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