单项选择题
A.open B.open front type C.live front type D.dead front type
Modern centrifuge designs enable continuous over a cons...
单项选择题Modern centrifuge designs enable continuous over a considerable period of timeThis is achieved by which is timed to discharge the sludge at regular intervals（）
A.an injection process B.an ejection process C.a separation process D.a heating process
The oil sump, a light welded design, is mounted on the ...
单项选择题The oil sump, a light welded design, is mounted on the engine block from below and sealed by （）
A.O-ring B.gasket C.washer D.packing
The air required for combustion is taken from the engin...
单项选择题The air required for combustion is taken from the engine room through a filter fitted on the turbochargerThis reduces the risk for too and contamination of the combustion air（）
A.high temperatures B.low temperatures C.wet D.dirty
