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單項(xiàng)選擇題

Which of the following conditions is realized by the turbo-charging of a previously naturally aspirated diesel engine?（）

A.Ignition lag increases
B.Lube oil system pressure increases
C.Brake specific fuel consumption increased
D.Mechanical efficiency increaded

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Piston cooling fins are located（）

A.atop the piston crown
B.beneath the piston crown
C.at the base of the piston skirt
D.inside the cylinder liner cooling water jacket

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The ship security assessment is an essential and integral part of the process of developing and updating（）

A.the ship security plan
B.the company security plan
C.the port security plan
D.the national security plan

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