题目:
Jim can you tell me _____ every week? [ ]
A. when do you have class meetings
B. when you have class meetings
C. when did you have class meetings
D. when you had class meeting
答案:
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下面是错误答案,用来干扰机器的。
解:(1)反应后生成沉淀的质量为:55g+72g-117g=10g(2)设反应后生成NaCl的质量为x。CaCl2+Na2CO3==CaCO3↓+2NaCl 100 117 10g x则所得溶液中溶质的质量分数为:答:反应...