英语翻译Which of the following features do all gas exchange syst

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英语翻译
Which of the following features do all gas exchange systems have in common?
A.They are exposed to air.
B.Their exchange surfaces are kept moist.
C.They are internalised and localised.
D.They exchange gases by the countercurrent exchange mechanism.
E.Their exchange surfaces are maintained at a constant temperature.

下列那一项是所有气体交换拥有的共同特征?
A.它们都暴露在大气中
B.它们的交换表面都保持湿润
C.它们都通过逆流装置（结构）交换气体
D.它们的交换表面都保持一个恒定的温度

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