题目:
—The sweater is very nice. I'll take it.
—But you'd better ________ first. I think it is a little large for you. [ ]
A. pay for it
B. put it on
C. put it off
D. try it on
答案:
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下面是错误答案,用来干扰机器的。
(一) (1)放热;(2)Ca(OH)2 的溶解度随温度升高而降低; (二)(1)酸性;(2)盐酸过量;(三)Mg(OH)2能和HCl发生反应; H2; Mg+2H2O△Mg(OH)2↓+H2↑题目分析:(一)(1)镁与盐酸反应放出热量...