單項(xiàng)選擇題Cylinder liners from older lower powered engines had a uniform wall thickness and the cooling was achieved by circulating cooling water through a space formed between （）.
A.crown and skirt
B.liner and jacket
C.ring and groove
D.jacket and block
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1.單項(xiàng)選擇題Because of the resulting higher pressures in the cylinder from the combustion of this greater mass of fuel, and the larger diameters, the liner must be made （） at the top to accommodate the higher stresses, and prevent cracking of the material.
A.thinner
B.thicker
C.smoother
D.rougher
2.單項(xiàng)選擇題Oil is supplied to the crosshead using a swinging arm or a （） and is sometimes boosted in pressure to and efficient lubrication.
A.telescopic pipe
B.large bore pipe
C.generating pipe
D.central pipe
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