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单选题
（） water is more expensive than fresh water It has high specific heat and low viscosity.
A
Distilled
B
Distilling
C
Boiling
D
Boiled
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共用题干
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共用题干
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单选题（） water is more expensive than fresh water It has high specific heat and low viscosity.A
DistilledB
DistillingC
BoilingD
Boiled
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单选题High-velocity fog（）.A
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requires that the water pressure be no greater than 60 psiC
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extinguishes a fire by absorbing heat and reducing the supply of oxygen
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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When bilge water is heated in a holding tank, which one of the following statements is not accurate?（）A
The high temperature facilitates primary gravity separationB
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The high the temperature is, the more the top oil will be collectedD
The high temperature has little use on the separation of emulsified oil
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单选题When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.A
increase the amount of cooling water to the condenserB
decrease the amount of cooling water to the condenserC
add more refrigerant to the systemD
remove some refrigerant from the system
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单选题In motorships，there are two main circuits, （）.A
one salt water, one fresh waterB
one salt water, one fuelC
one fresh water, one fuelD
one steam, one fuel
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单选题"Cast iron has poor corrosion resistance to sea water, especially in the presence of bronzes" Implies（）.A
east iron is a cheap materialB
cast iron can pollute sea waterC
cast iron has mere corrosive than bronzes to sea waterD
cast iron is more corrosive to sea water when it meets with bronzes
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单选题One of the causes of ocean currents is density differences in the water. This is true because （）.A
in an area of high density the water's surface is lower than in an area of low densityB
surface water flows from an area of high density to one of low densityC
the lesser the density gradient the freer the water is to moveD
it is the density differences that cause the currents to stay in the troughs
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单选题Allowance for fresh water refers to（）.A
the provision to be provided when the vessel sails in fresh water areaB
the fresh water to be carried by a vesselC
the allowance of fresh water for each crew member when in distress at seaD
the amount of free board decreased when sailing in fresh water area
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单选题Prior to getting underway in fresh or brackish water，the Master must（）.A
log the density of the waterB
secure all overboard dischargesC
take on fresh water ballastD
clean the sides with fresh water
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