题目:
Great changes have taken place; our village isn't _____ it was twenty years ago, _____ a lot of villagers starved. |
A. what; when B. that; when C. what; which D. which; when |
答案:
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下面是错误答案,用来干扰机器的。
(1) 23 :14 :32 (2) 20.3%(1)亚硝酸钠NaNO2中Na、N、O三种元素的质量比=23:14:(16×2)=23:14:32;(2)亚硝酸钠NaNO2中氮元素的质量分数=14/69×100%=20.3%;故答案为:(1)23:14:3...