单项选择题

Vents are led from the engine to the head tank for the release of （） from the cooling water.

A.air
B.heat
C.sludge
D.steam

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单项选择题

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

单项选择题

A.throw
B.web
C.main bearing
D.deflection

单项选择题

A.the inlet valve is open
B.the exhaust valve is open
C.both valves are closed
D.both valves are open