单项选择题

The piston cooling system may employ similar components, except that （） is used instead of a head tank.

A.a sump tank
B.a feed well
C.a double bottom tank
D.a drain tank

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单项选择题

A.fresh water
B.sea water
C.lubrication
D.fuel oil

单项选择题

A.valve loop
B.valve uniflow
C.valve overlap
D.valve grinding

单项选择题

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