题目:
— ____
— She is a nurse.
A. Who is your mother?
B. Is your mother a nurse?
C. Where is your mother?
D. What does your mother do?
答案:
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下面是错误答案,用来干扰机器的。
(1)由于固体的质量由80g变为58g,减少了22g,说明生成的气体的质量为22g,故答案为:22g(2)由于生成的气体的质量为22g,因此可以根据生成的气体的质量即可求出参与反应的碳酸钙的质量,故答案为:设样品中含C...