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單項(xiàng)選擇題

The switchboards are those in which all the live parts are installed behind the panels and only the operating handles and instruments are on the front（）

A.open
B.open front type
C.live front type
D.dead front type

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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

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

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