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【判断题】
铸铁中铸造性能最好的为球墨铸铁,力学性能最好的为灰铸铁。
A.
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B.
错误
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举一反三
【单选题】Which of the following problems can cause fluctuating pressures in the closed cooling system of a main propulsion diesel engine?
A.
Defective temperature controls in the system
B.
Cavitation in the cooling water pump
C.
Opened vent in the cooling system
D.
Restricted water passages in the engine
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【单选题】In a closed cooling water system, which of the problems can cause the water pressure to fluctuate?
A.
An open vent in the cooling system
B.
A fouled sea chest
C.
A restricted water passage in the engine
D.
Air entrained in the cooling water
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【判断题】ROI= return on sales / capital turnover.
A.
正确
B.
错误
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【单选题】The highest pressure in any closed diesel engine freshwater cooling system is at the _____.
A.
jacket water outlet
B.
expansion tank inlet
C.
heat exchanger inlet
D.
cooling water pump outlet
查看完整题目与答案
【单选题】The jacket water temperature in a diesel engine closed freshwater cooling system is normally controlled by _____.
A.
regulating the level of corrosion inhibitor in the primary cooling system
B.
the level of the freshwater expansion tank
C.
varying the engine load to meet temperature requirements
D.
the operation of the thermostatic valve
查看完整题目与答案
【判断题】Returns can only be measured in accounting terms such as return on assets, return on equity, or return on sales.
A.
正确
B.
错误
查看完整题目与答案
【单选题】In a closed cooling system for a turbocharged, four-stroke/cycle diesel engine, fluctuating water pressure can be caused by .
A.
improper venting of the cooling system
B.
carrying the expansion tank water level too high
C.
a totally clogged impeller in the cooling water pump
D.
an incorrectly set cooling system temperature control
查看完整题目与答案
【单选题】Operating a diesel engine for prolonged periods, with a closed freshwater cooling system, at temperatures lower than the normal design temperature can cause _____.
A.
the formation of sulfuric acid
B.
a decrease in lube oil viscosity
C.
a decrease in cooling water pH
D.
a thermostat failure
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【简答题】Our sales confirmation No． BC510 in two (8) were airmailed to you． Please sign and return one copy of them for our (9) ．
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【单选题】In any diesel engine closed freshwater cooling system, the lowest pressure exists at the _____.
A.
jacket water outlet
B.
cooling water pump outlet
C.
heat exchanger outlet
D.
expansion tank atmospheric vent
查看完整题目与答案
相关题目：
【单选题】Which of the following problems can cause fluctuating pressures in the closed cooling system of a main propulsion diesel engine?
A.
Defective temperature controls in the system
B.
Cavitation in the cooling water pump
C.
Opened vent in the cooling system
D.
Restricted water passages in the engine
查看完整题目与答案
【单选题】In a closed cooling water system, which of the problems can cause the water pressure to fluctuate?
A.
An open vent in the cooling system
B.
A fouled sea chest
C.
A restricted water passage in the engine
D.
Air entrained in the cooling water
查看完整题目与答案
【判断题】ROI= return on sales / capital turnover.
A.
正确
B.
错误
查看完整题目与答案
【单选题】The highest pressure in any closed diesel engine freshwater cooling system is at the _____.
A.
jacket water outlet
B.
expansion tank inlet
C.
heat exchanger inlet
D.
cooling water pump outlet
查看完整题目与答案
【单选题】The jacket water temperature in a diesel engine closed freshwater cooling system is normally controlled by _____.
A.
regulating the level of corrosion inhibitor in the primary cooling system
B.
the level of the freshwater expansion tank
C.
varying the engine load to meet temperature requirements
D.
the operation of the thermostatic valve
查看完整题目与答案
【判断题】Returns can only be measured in accounting terms such as return on assets, return on equity, or return on sales.
A.
正确
B.
错误
查看完整题目与答案
【单选题】In a closed cooling system for a turbocharged, four-stroke/cycle diesel engine, fluctuating water pressure can be caused by .
A.
improper venting of the cooling system
B.
carrying the expansion tank water level too high
C.
a totally clogged impeller in the cooling water pump
D.
an incorrectly set cooling system temperature control
查看完整题目与答案
【单选题】Operating a diesel engine for prolonged periods, with a closed freshwater cooling system, at temperatures lower than the normal design temperature can cause _____.
A.
the formation of sulfuric acid
B.
a decrease in lube oil viscosity
C.
a decrease in cooling water pH
D.
a thermostat failure
查看完整题目与答案
【简答题】Our sales confirmation No． BC510 in two (8) were airmailed to you． Please sign and return one copy of them for our (9) ．
查看完整题目与答案
【单选题】In any diesel engine closed freshwater cooling system, the lowest pressure exists at the _____.
A.
jacket water outlet
B.
cooling water pump outlet
C.
heat exchanger outlet
D.
expansion tank atmospheric vent
查看完整题目与答案
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