单项选择题
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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相关考题
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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 -
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 -
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
