A . Cylinder cover
B . Main bearing
C . The exhaust valve
D . The piston movement
[单选题]Air cocks, usually positioned at the () in a circulating system, is used to get rid of the air in the system.A . bending jointB . expansion tankC . weldD . the highest point
[单选题]The pressure of pilot air is usually () than that of starting air.A . higherB . lowerC . lowD . high
[单选题]The pressurized air is usually cooled to increase the charge air ().A . viscosityB . densityC . velocityD . electricity
[单选题]A.ir cocks, usually positioned at the_______in a circulating system, is used to get rid of the air in the system.A.bending jointB.expansion tankC.weldD.the highest point
[单选题]The starting air system usually has () to prevent starting if anything is not in order.A . stop valvesB . interlocksC . non-return valvesD . air vent
[多选题]Usually original air way bill separate for ( ).A.consigneeB.shipperC.issuin
[多选题]Usually original air way bill separate for ( ).A.consigneeB.shipperC.issuin
[单选题]Land (or ground) freighttransport is movement of goods from one location to
[单选题]Land (or ground) freight transportis movement of goods from one location to
[单选题]Commodities shipped by air usually have high values per unit or are ().A.co