题目内容

You have to work harder to make up for the______(lose) time.

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绝热性能好的材料,吸音性能也好。()

三元乙丙橡胶不适合用于严寒地区的防水工程。()

Some symptoms and signs ______are readily apparent to the patient.

In the first paragraph, what did the author try to tell us?

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