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单选题
Grease coatings on electrical contact surfaces increase contact resistance and should be removed with a/an （）.
A
small wire brush
B
compressed air jet
C
clean dry cloth
D
10% solution carbon solvent and water
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单选题Grease coatings on electrical contact surfaces increase contact resistance and should be removed with a/an （）.A
small wire brushB
compressed air jetC
clean dry clothD
10% solution carbon solvent and water
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单选题When a rescuer finds an electrical burn victim in the vicinity of live electrical equipment or wiring，his first step is to（）.A
flush water over any burned area of the patientB
apply ointment to the burned areas on the patientC
get assistance to shut down electrical power in the areaD
remove the patient from the vicinity of the live electrical equipment or wiring
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单选题When preparing a ship for heavy weather，fuel oil day tanks should be（）.A
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filled to ensure that sufficient fuel oil is available during a lengthy emergencyD
partially drained to increase free surfaces in order to reduce motions
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单选题A tank which has been sealed for a long period of time can be dangerous because （）.A
steel surfaces consume oxygen by rustingB
sealed tanks usually form a vacuumC
moisture condenses in the tank, displacing the oxygenD
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单选题In order to increase the wearing resistance, the cylinder liner surfaces are sometimes （）.A
aluminum-platedB
bronze-platedC
zinc-platedD
chromium-plated
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单选题In most pumps and pump motors overpacking the ball bearings full of grease will result in （）A
moisture emulsification of the bearing greaseB
insufficient circulation and overheating of the bearingC
proper grease circulation to cool the bearingD
sliding friction between balls and races
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单选题Generally the function of lubrication is to form of a film of lubricant between any two surfaces that have relative （）, so that surfaces dont get touch with each other.A
gravityB
motionC
ratioD
density
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单选题How are riveted lap joints made watertight（）.A
The faying surfaces are coated with white lead（or similar product）before the rivets are setB
A sealing weld bead of 1/8 or less pitch is run along the plate edgeC
The plate edge is split close to an adjacent plate and mechanically forced into contact with the adjacent plateD
A properly riveted joint will be watertight; any leakage is stopped by setting up on the rivets
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单选题What are the most important reasons for using water fog to fight fires?（）A
Smothers burning surfaces，organically destroys fuelB
Cools fire and adjacent surfaces，provides protective barrierC
Reaches areas not protected by steam or CO2 smothering systemsD
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考题
单选题Before reassembling any machinery, you should （）.A
replace all bearings regardless of length of serviceB
apply a heavy coat of oil to all mating surfacesC
clean any corroded surfaces and file all burrs smoothD
coat all parts with alemite grease
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