单选题Vents are led from the engine to head tank （） from the cooling water.Afor the release of airBfor the release of waterCin order to the release of airDbecause the release of air
单选题
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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