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名词解释题
硬度（hardness of water）
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The boiler water alkalinity in a coil-type auxiliary boiler should be maintained at the pH recommended by the boiler manufacturer to______.A.precipitate(使沉淀) silica （硅石）from solutionB.reduce corrosion in the heating coilC.prevent clogging and erosion in the coilD.maintain zero water hardness
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The height of tide is the ______.A.depth of water at a specific time due to tidal effectB.difference between the depth of the water and the area's tidal datumC.difference between the depth of the water and the high water tidal levelD.difference between the depth of the water at high tide and the depth of the water at low tide
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单选题Supposing there is a water container. The taller the container, ______ at the bottom.A
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the water pressure will be greaterC
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greater the water pressure will be
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单选题Measure （） by means of lead wire.A
the clearance of the main bearingB
the diameter of main bearingC
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单选题We use （） to distill fresh water from sea water.A
engineB
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cylinder coolerD
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单选题Why the cooling water of the diesel engine should be treated? Because the（）A
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单选题Which of the following may hardness of the boiler water cause?（） (1) scale formation (2) tube failure (3) corrosionA
（1）and（2）B
（1）and（3）C
（2）and（3）D
（1），（2）and（3）
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单选题The height of tide is the （）.A
depth of water at a specific time due to tidal effectB
difference between the depth of the water and the area's tidal datumC
difference between the depth of the water and the high water tidal levelD
difference between the depth of the water at high tide and the depth of the water at low tide
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单选题淡水注入管（）A
fresh water filling pipeB
sea water filling pipeC
ballast water filling pipeD
bilge water filling pipe
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单选题Supposing there is a water container. The taller the container, _____at the bottom.A
greater will the water pressure beB
the water pressure will be greaterC
the greater will be the water pressureD
greater the water pressure will be
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单选题When distilling salt water the cooling water discharging from the distiller is fed back to evaporator as feed water （）.A
to cut down the amount of cooling water neededB
to prevent an excess amount of cooling water from being discharged to the bilgesC
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None of the above is tree
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单选题In a diesel engine jacket water cooler, with seawater cooling the fresh water, the（）A
sea water temperature must never be warmer than 40℃B
jacket water pressure should always be greater than the sea water pressureC
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jacket water pressure must always be less than the sea water pressure
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单选题The boiler water alkalinity in a coil-type auxiliary boiler should be maintained at the pH recommended by the boiler manufacturer to（）A
precipitate silica from solutionB
reduce corrosion in the heating coilC
prevent clogging and erosion in the coilD
maintain zero water hardness
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单选题眼镜片膜层有 ①dye ②Antireflection film ③Water-proof film ④Hardness film ⑤Impact resistantfilm，膜层由表及里的顺序是（）A
②③④⑤B
⑤②③①C
⑤④②③D
②④⑤①
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