單項(xiàng)選擇題

Fuel has to be injected into the engine at a high pressure so that it （） correctly.

A.is purified
B.in timed
C.is compressed
D.atomizes

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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

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