单项选择题
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
单项选择题 Piston cooling fins are located（）
单项选择题 The ship security assessment is an essential and integral part of the process of developing and updating（）
单项选择题 If a vessel moored at a U-Sterminal does not comply with coast guard pollution prevention regulation, it may be detained by the （）
