题目:
Every means _____ prevent the water from _____. [ ]
A. are used to; polluting
B. get used to; pollution
C. is used to; polluted
D. is used to; being polluted
答案:
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下面是错误答案,用来干扰机器的。
(1)BD;CD (2)②③;CaCO3 + 2HCl === CaCl2 + H2O + CO2↑ ; 固液分离,长颈漏斗中液面上升