Opening of the cylinder （） will admit compressed air into the cylinder.

[单选题]The opening or closing of the cylinder starting valve is controlled by （）.A . the starting air distributorB . the cut-off valve on the air mainC . the main starting valveD . the air bottle control valve

[单选题]The cylinder head, cylinder liner and （） form the combustion chamber.A . frameB . pistonC . crankcaseD . explosion plate

[单选题]（） is used for cylinder and cylinder head, the salt water is used for cooling the lubricating oil, the fresh water in the coolers and the charging air in the air cooler.A . The fuel oilB . The lube oilC . The sea waterD . The fresh water

[单选题]Cracks in cylinder and cylinder covers may （） from unequal heating.A . makeB . causeC . resultD . produce

[单选题]The opening of an exhaust valve on a modem, large, low-speed, main propulsion diesel engine may be actuated by （）.A . direct action of cam shaftB . compressed air pressureC . hydraulic “push rods”D . direct action of the main piston movin

[单选题]I must admit my whole heart is( )being a medical biologist.A.set offB.put o

[单选题]The trip to that city was eye-opening for everyone, and near its end, all the young people in our group began to reflect on what it had meant. We __21___the first night we had arrived. We had all gone into the markets of the city ___22__the young peo

[单选题]The cylinder cover is not provided with ( )A．fuel valveB．the starting valveC．lubricator

[单选题]The cylinder liners are made of _____ and the cylinder surfaces are sometimes chromium-plated.A．steelB．copperC．cast ironD．stainless steel

[单选题]The withdrawing of the cylinder liners, in general, depends on their （）.This may amount to approximately 1/120 of the diameter in some engines.A . correct maneuveringB . wearC . working efficiencyD . maintenance