A．is usually cooled by sea water
B．can be replaced when worn out
C．is in direct contact with the water in the bore of the cylinder
D．can t expand when heated
[单选题]Each cylinder liner on the marine medium speed engines （）.A . is usually cooled by sea waterB . can be replaced when worn outC . is in direct contact with the water in the bore of the cylinderD . can t expand when heated
[单选题]The cylinder head, cylinder liner and （） form the combustion chamber.A . frameB . pistonC . crankcaseD . explosion plate
[单选题]The space between cylinder liner and jacket is called _____.A．the cooling waterB．the circulating waterC．the coolerD．the cooling water space
[单选题]A． crack in a cylinder liner can be caused byA．worn piston ringsB．installation of undersized sealing ringsC．operating the engine at low loadsD．restricted cooling water passages
[单选题]The space between cylinder liner and jacket is called （）.A . the cooling waterB . the circulating waterC . the coolerD . the cooling water space
[单选题]Cylinder liner cooling is often referred to as （）.A . piston coolingB . sleeve coolingC . central coolingD . jacket cooling
[单选题]In large marine diesel engines cylinder oils usually contain additives formulated to impart the （） to clean the rings and grooves.A . inefficiencyB . oilinessC . detergencyD . purity
[单选题]Pistons of marine medium speed diesel engines may be made of （） in order to keep the weight down for balancing purpose at high speed.A . leadB . forged steelC . alloy steelD . aluminum alloy
[单选题]E．ach cylinder is closed at the top by a _____, made of a special heat-resistant steel.A．cylinder linerB．coupling flangeC．cylinder coverD．piston crown
[单选题]It is very important that each cylinder should be （） scavenged before the charged air is compressed.A . wellB . goodC . excellentD . respectively