單項選擇題If the effective bearing area has been reduced , remedial action should be taken（）

A.by more than 5 percent
B.by less than 10 percent
C.to 95 percent
D.to less than 90 percent


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1.單項選擇題Main diesel engine control can be obtained by the bridge （）

A.at any time
B.only after the engine room control station is switched to ‘bridge control’
C.whenever the secondary station is switched to ‘bridge control’
D.whenever the engine side control station is switched to ‘bridge control’

2.單項選擇題The camshaft drive is designed to maintain proper camshaft speed relative to crankshaft speedIn maintaining this relationship, the camshaft drive causes the camshaft to rotate at（）

A.one half crankshaft speed in a two-stroke cycle diesel engine
B.crankshaft speed in a two-stroke cycle diesel engine
C.two times crankshaft speed in a two-stroke cycle diesel engine
D.one-fourth times crankshaft speed in a four-stroke cycle diesel engine