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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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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

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