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单选题
In a large, slow-speed, main propulsion diesel engine, which of the parts listed is under tension when the engine is running?（）
A
Bed plate
B
Column
C
Entablature
D
Tie rod
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单选题The power developed by a large slow-speed main propulsion diesel engine is dependent upon the （）A
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fuel must be preheatedB
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单选题The most practical way of detecting an overload in one cylinder of an operating large, low-speed ,main propulsion diesel engine is to （）A
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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 systemB
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ElectricB
HydraulicC
AirD
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high exhaust gas pyrometer readingsC
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Cooling water flow through after-coolersD
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