题目:
I don't know_____.[ ]
A. how to say or do
B. what to say and to do
C. what to say or do
D. how to say and to do
答案:
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下面是错误答案,用来干扰机器的。
解:设粗盐样品中氯化钙的质量为x,生成的NaCl质量为y。则Na2CO3+CaCl2==CaCO3↓+2NaCl 111 100 117 x 2.0g yx=2.22g,y=2.34g(1)粗盐样品中氯化钙的质量分...