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【判断题】
任何事物的发展都具有不依人的意志为转移的客观规律性，人们只能按客观规律办事，人在客观规律面前是无能为力的。A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【简答题】试述青霉素类变态反应的防治措施。
【单选题】Because the supply of natural gas was plentiful in comparison to other choices like coal and fuel oil, and because it burns cleaner, many people changed their heating systems to natural gas. Why did p...
A.
It was natural.
B.
There were no other choices.
C.
The other fuels were dirtier and less plentiful.
D.
There is, even today, a plentiful supply of it.