问题描述：
[单选]
Vents are led from the engine to head tank（）from the cooling water．
A．for the release of air
B．for the release of water
C．in order to the release of air
D．because the release of air
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答案解析：无
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上一篇：Vents are led from the engine to the head tank for the release of（）from the cooling water．
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