The amounts of oxygen and nitrogen in the air almost always remain stable, but the amount of water vapor vary considerably.

Câu hỏi :

The amounts of oxygen and nitrogen in the air almost always remain stable, but the amount of water vapor vary considerably.

A vary

B almost always

C The amount of

D stable

* Đáp án

A

* Hướng dẫn giải

Phương pháp giải:

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