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单选题
The main operating characteristic of diesel engines which distinguishes them from other internal combustion engines is the （）
A
method of supplying air
B
cooling system
C
method of igniting fuel
D
valve operating mechanism
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单选题The main operating characteristic of diesel engines which distinguishes them from other internal combustion engines is the （）A
method of supplying airB
cooling systemC
method of igniting fuelD
valve operating mechanism
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单选题In some modern large diesel engines, which of the following is used as the support for the main bearings?（）A
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BlockC
BaseD
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单选题Which of the following conditions may need to be reduced when operating a large, low speed, main propulsion, diesel engine at low loads?（）A
Injection pressuresB
Control air supply pressureC
Cooling water flow through after-coolersD
Lube oil temperature
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