單項(xiàng)選擇題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
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1.單項(xiàng)選擇題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
2.單項(xiàng)選擇題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
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