It is very important that each cylinder should be （） scavenged before the charged air is compressed.

[单选题]It is very necessary that each cylinder （） before the charged air is compressed.A . is scavengedB . is atomized with fuel oilC . be scavengedD . be atomized with fuel oil

[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]The bore of each cylinder is formed in a liner which can be （） when worn out.A . weldedB . replacedC . drilled againD . bored

[单选题]Each cylinder is closed at the top by a （）, made of a special heat-resistant steel.A . cylinder linerB . coupling flangeC . cylinder coverD . piston crow

[单选题]In each cylinder cover there are two or three holes for （）A . the exhaust valvesB . the fuel valvesC . indicator cocksD . the fuel pum

[单选题]E．ach 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]In each cylinder cover is a large central opening for mounting （）A . the indicating cockB . the starting valveC . air inlet valveD . the exhaust valve

[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

[多选题] Insurance is very important to logistics because of the potential hazards and dangers in the process,such as（）.A . fireandtheftB . unqualifiedproductsC . techniqueproblemD . andevennaturaldisasters

[单选题]It is important that the water （） very often as this can lead to increased deposits.A . not be changedB . be changedC . should not be changedD . should be changed