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Primer coats are applied to a bare metal surface to （）protection against rust.
- A、let
- B、give
- C、prevent
- D、take
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材料：Spark erosion is caused by a voltage discharge between the main bearing and journal surface. The cause of the potential is the development of a galvanic element between the ship’s hull, sea water, and the propeller shaft/crankshaft.The oil film acts as a dielectric. The puncture voltage in the bearing depends on the thickness of the oil film. With increasing engine ratings, the specific load in the main bearing is increased. his will reduce the oil film thickness, and enable the discharge to take place at a lower voltage level.Since the hydrodynamic oil film thickness varies through a rotation cycle, the discharge will take place at roughly the same instant during each rotation cycle, i.e. when the film thickness is at its minimum. The roughening will accordingly be concentrated in certain areas on the journal surface. In the early stages, the roughened areas can resemble pitting erosion. but later, as the roughness increases, the small craters will scrape off and pick up white metal-hence the silvery white appearance.Therefore, to ensure protection against spark erosion, the potential level must be kept at maximum 80 mV, which is feasible today with a high efficiency earthing device. If an earthing device is installed, its effectiveness must be checked regularly. Spark erosion is only observed in main bearings and main bearing journals.问题：According to the paragraph one, a voltage between the main bearing and journal surface is produced by______.A.propeller rotationB.leakage from M/E electric control unitC.a galvanic elementD.friction between the main bearing and journal surface______engine ratings increase, the hydrodynamic oil film between the main bearing and journal surface is______.A.The lower/thinnerB.The higher/the thickerC.The lower/thickerD.The higher/thinnerWhen will the spark erosion take place on the journal surface during each rotation cycle?A.when the film thickness is at its minimumB.when the film thickness is at its maximumC.when the engine is on its compression strokeD.when the engine is on its exhaust strokeDuring the engine room watch keeping, which equipment must be noted to ensure protection against spark erosion?A.the antifouling plantB.the earthing deviceC.the main engine electric heating coilsD.the shaft generator请帮忙给出每个问题的正确答案和分析，谢谢！
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（）are the three different coatings which can protect metal from corrosion.A、Cement wash, bitumen and paintB、Metal primers, undercoats and topcoatsC、Varnishes, heat-resistant paints and anti-fouling paintsD、Cement wash, primer and undercoat
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A bare metal surface should be applied with the （）(防腐漆).A、anti-corrosive paintB、anti-fouling paintC、heat-resistant paintD、non-slip paint
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底漆用于出白金属表面， 防止其生锈。（）A、Topside paint is applied to a bare surface to give protective against rust.B、Undercoat is applied to a bare surface to give protection against rust.C、Primer coat is applied to a bare surface to give protection against rust.D、Topcoat is applied to a bare surface to give protection against rust.
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（）is applied to the area of the ship’s hull which is out of water when the ship is loaded.A、Boottopping paintB、Topside paintC、Bottom paintD、Primer
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A （）(钢丝刷) should be used on all bare metal to remove the last of the scale.A、wire brushB、wire ropeC、wire rodD、wire rope clip
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Apply two coats of red lead primer and topside paint （）the forecastle deck.A、forB、withC、toD、at
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A bare metal backup requires which of the following backup method ologies？（）A、 FullB、 DifferentialC、 IncrementalD、 Database
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Which of the following is the MOST space efficient server chassis type within a server rack？（）A、 Tower serverB、 Bare metal serverC、 Blade serverD、 Rack server
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A bare metal backup requires which of the following backup methodologies?（）A、FullB、DifferentialC、IncrementalD、Database
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单选题底漆用于出白金属表面， 防止其生锈。（）A
Topside paint is applied to a bare surface to give protective against rust.B
Undercoat is applied to a bare surface to give protection against rust.C
Primer coat is applied to a bare surface to give protection against rust.D
Topcoat is applied to a bare surface to give protection against rust.
考题
单选题Primer coats are applied to a bare metal surface to （）protection against rust.A
letB
giveC
preventD
take
考题
单选题首楼甲板涂上两度红丹漆和干舷漆。（）A
Apply two coats of red lead primer and topside paint to the forecastle deck.B
Apply two coats of red lead primer and boottopping paint to the forecastle deck.C
Apply two coats of topside paint and red lead primer to the poop deck.D
Apply two coats of red lead primer and topside paint to the poop deck.
考题
单选题Apply two coats of red lead primer and topside paint （）the forecastle deck.A
forB
withC
toD
at
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单选题Primer coats are applied to a bare metal surface to give protection against （）.A
rustB
dirtC
dustD
air
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单选题The piston ring grooves for a standard engine are （）A
chromium-plate against wearB
anti-corrosion treatedC
white metal lined against wearD
flame hardened against wear
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单选题The first coat to a bare metal surface is the （）(底漆).A
undercoatB
primerC
topcoatD
thinner
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单选题Which of the following is the MOST space efficient server chassis type within a server rack？（）A
Tower serverB
Bare metal serverC
Blade serverD
Rack server
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