问题
填空题
无数实验证明，参加化学反应的各物质的______，等于反应后生成的各物质的______．这个规律叫做质量守恒定律．
答案
质量守恒定律的内容是参加化学反应的各物质的质量总和等于反应后生成的各物质的质量总和，所以本题答案为：质量总和，质量总和．
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无数实验证明，参加化学反应的各物质的______，等于反应后生成的各物质的______．这个规律叫做质量守恒定律．
质量守恒定律的内容是参加化学反应的各物质的质量总和等于反应后生成的各物质的质量总和，所以本题答案为：质量总和，质量总和．
A: 小题1: Mike? B: I’m reading a magazine about UFO. A: Really? 小题2: B: Well. 小题3: The universe(宇宙) is so big and three millions of stars in it. I think there must be some kinds of living creatures(生物) in the outer space. They may be clever than us. 小题4: Have you heard of the reports about the UFOs which flew over Beijing, Wuhan and Hangzhou recently(最近)？ A: Oh, yes. And I’ve also read some other reports about the UFOs. B: 小题5: A: Well, I can’t really agree with you.
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