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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

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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

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For most ship engines，the fuel is（）.

A.natural gas
B.diesel oil
C.propane
D.bunker fuel

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