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【单选题】
静电场中电力线任意一点切线的方向与该点的电场矢量的方向（ ）A.
相同
B.
垂直
C.
相反
D.
无关
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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
【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
【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
【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
【单选题】If the coolant temperature of a closed cooling water system for a diesel enginegradually increases, the trouble usually is( ).
A.
a broken shaft on the freshwater pump
B.
an excessive accumulation of scale in the heat exchanger
C.
an incorrect thermostatic element operating range
D.
lube oil in the cooling water
【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
【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) ．
【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
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