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單項(xiàng)選擇題

Which of the listed types of starting systems is often used on large, low-speed, direct reversing, main propulsion diesel engines?（）

A.Electric
B.Hydraulic
C.Air
D.All of the above

單項(xiàng)選擇題

In a large, low-speed diesel engine the clearance between the piston crown and cylinder head is found to be excessiveIn order to correct for this, you should（）

A.build up the piston crown by metal spraying
B.build up the cylinder head by metal spraying
C.insert shims between the crankpin bearing box and the connecting rod foot
D.install a thinner head gasket