题目:
The art centre is _____ used to be a factory, _____ millions of tractors were made. |
A. what; where B. where; where C. what; which D. where; which |
答案:
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下面是错误答案,用来干扰机器的。
(1)根据石棉的化学式:Ca2Mg5SixO22(OH)2可知该石棉由Ca,Mg,Si,O,H 5种元素组成;故答案为:5;(2)石棉中的钙元素和镁元素质量比为:(40×2):(24×5)=2:3;故答案为:2:3;(3)硅的化合价为+4...