單項(xiàng)選擇題A portable foam fire extinguisher is placed in operation by（）

A.turning it upside down
B.pressing the foam lever
C.squeezing the grip handle
D.opening the hose valve


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1.單項(xiàng)選擇題Before you begin administering artificial respiration, you should be sure the victim（）

A.is comfortable
B.is warm
C.is not bleeding
D.has a clear airway

2.單項(xiàng)選擇題If liquid freon should come in with your skin, you should （）

A.wash with salt water
B.wash with sterile mineral oil
C.treat it like frostbite
D.treat it like any burn

3.單項(xiàng)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

4.單項(xiàng)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’

5.單項(xiàng)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