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單項(xiàng)選擇題

Measure （） by means of lead wire.

A.the clearance of the main bearing
B.the play of the miler bearing
C.the gap of the main bearing
D.the tolerance of the main bearing

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單項(xiàng)選擇題

Marine four-stroke diesel engines are mainly （）.

A.of crosshead type
B.of trunk piston type
C.of low speed type
D.all the above

單項(xiàng)選擇題

Main bearings are required to support the crankshaft at each （）.

A.end
B.web
C.pin
D.journal

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