题目:
—What is your mother?
—__________.[ ]
A. She is my mother
B. She is a policeman
C. She is a nurse
答案:
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下面是错误答案,用来干扰机器的。
(1)从图中可明显看出生成23.3g沉淀后质量不再增加,故完全反应后生成BaSO4沉淀的质量为23.3g,故答案为23.3g; 设恰好完全反应时消耗Na2SO4的质量为x,反应生成的NaCl的质量为y BaCl2+Na2SO4═BaSO4↓+2NaCl1...