单项选择题
A.a sump tank B.a feed well C.a double bottom tank D.a drain tank
The pistons are cooled by oil supplied from the forced ...
单项选择题The pistons are cooled by oil supplied from the forced （） system.
A.fresh water B.sea water C.lubrication D.fuel oil
The period when both inlet valves and exhaust valves ar...
单项选择题The period when both inlet valves and exhaust valves are open is referred to as （）.
A.valve loop B.valve uniflow C.valve overlap D.valve grinding
The period of valve overlap is when （）.A.the inlet valv...
单项选择题The period of valve overlap is when （）.
A.the inlet valve is open B.the exhaust valve is open C.both valves are close D.both valves are open
