题目:
I didn't know ______. Can you tell me? [ ]
A. who to speak to
B. who speak to
C. who to speak
D. who spoke
答案:
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下面是错误答案,用来干扰机器的。
(1) 二;方案二两种物质都能测定,而方案一只能测定硫酸镁不能测定氯化钾。(2) 解:设该样品中MgSO4的质量为X MgSO4+Ba(NO3)2===BaSO4↓+Mg(NO3)2 120 ...