单项选择题

How would the exhaust of a properly operating diesel engine appear?（）.

A.Light blue haze
B.Light brown haze
C.Light gray haze
D.Perfectly clear

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单项选择题

How should you warm up a diesel engine that has not been run for some time? （）

A.Run it at minimum speed for a period of time
B.Run it at half speed for a period of time
C.Bring it to top speed immediately
D.Inject ether into the air intake

单项选择题

How does combustion air enter the cylinder of a two-cycle diesel engine?（）

A.Cylinder head valves
B.Ports
C.Turbo chargers
D.Bleeder valves

单项选择题

Generally speaking，the fuel injected into a marine diesel engine combustion chamber is ignited by（）.

A.spark plugs
B.glow plugs
C.heat of compression
D.a magneto