单项选择题

沥青的塑性用（）表示。 A. 针入度 B. 坍落度 C. 延伸度 D. 软化点

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醛和酮可通过催化加氢的方法还原成醇。醛被还原成伯醇，酮则被还原成仲醇。

答案：正确

单项选择题

Definitions from authoritative （权威的）sources such as books or dictionaries are more reliable than self-made definitions, so we should avoid making an original definition as much as possible.
A、正确
B、错误