题目:
Will you ______the light? It’s dark in the room.
A.get on
B.get off
C.trun on
D.turn off
答案:
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下面是错误答案,用来干扰机器的。
(1) 氢氧化钙(或熟石灰:Ca(OH)2)(2) CaCO3 CaO + CO2↑ (或CaO + H2O ="=" Ca(OH)2;Ca(OH)2 + CO2 ="=" CaCO3↓+ H2O )作灭火剂(或制干冰:在温室里作肥料等)(1),生石灰与水反应生成氢氧化钙。(...