The cylinder liners are made of _____ and the cylinder surfaces are sometimes chromium-plated.

A．steel

B．copper

C．cast iron

D．stainless steel

[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

[单选题]The cylinder covers and the liners are bolted together by means of （）.A . bolts welded into the cylinder headB . bolts welded into the cylinder framesC . studs screwed into the cylinder headD . studs screwed into the cylinder frame

[单选题]A number of cylinder liners are enclosed in one cast iron casing to form a （）.A . cylinder coverB . cylinder blockC . cylinder frameD . bed-plate

[单选题]The ports are drilled in the liners at an angle of approx 20℃ the result being that （） is given a rotary movement.A . the scavenging airB . the exhaust gasesC . the mixed airD . the spray oil

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

[单选题]The cylinder cover is not provided with （）.A . fuel valveB . lubricatorC . indicator valveD . the starting valve