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Gas exchange takes place in lung and whole body tissues, and the precondition of exchange is （）.
Gas exchange takes place in lung and whole body tissues, and the precondition of exchange is （）.
正确答案：gas permeable membrane
标签：
动物解剖生理
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There are three ways of breathing: chest, abdomen and （）.
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During the transportation of oxygen, most of it relies on （） in red blood cells as carrier, and a small part of it dissolves directly in plasma.