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

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

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