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

单项选择题 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 （）.

单项选择题 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.