Each cylinder has one starting valve which is usually opened by air pressure and closed by （）

[单选题]In the event of the cylinder starting valve leakage （） would pass into the air pipes and ignite the oil deposited.A . cooling waterB . vapor from the boilerC . starting airD . hot gase

[单选题]When the starting air valve closes on one cylinder, another starting air valve has （） opened on another cylinder whose piston has just commenced its downward stroke.A . justB . nearlyC . merelyD . already

[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

[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]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]Starting from 22, ________.[A] one will obtain more basic rights[B] the older one becomes, the more basic rights he will have[C] one won’t get more basic rights than when he is 21[D] one will enjoy more rights granted by society

[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