Cross scavenging requires the fitting of （） to prevent air or exhaust gas escape when the piston is at the top of the stroke.

[单选题]After fitting back in place the gear wheels, dont forget （） them.A . to greaseB . greasingC . oilingD . lubricating

[单选题]Clearance volume scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished （）.A . during the valve overlap periodB . with only the exhaust valve openC . at a pressure below atmosphericD . without cooling the cylinders or pisto

[单选题]The scavenging air ports are located at （） that they are just exposed by the upper edge of the piston when the piston is in the bottom dead center position.A . so a heightB . such a heightC . so highD . such high

[单选题]Scavenging is （） of exhaust gases by blowing in fresh air.A . the suctionB . the compressionC . the removalD . the deliver

[单选题]On top of scavenging air box is mounted a strong cast iron frame for each cylinder known as（）A . cooling jacketB . cylinder linerC . piston crownD . cylinder cover

[单选题]Scavenging in a four-stroke/cycle diesel engine occurs during the （）.A . last part of the exhaust stroke, and the first part of the intake strokeB . last part of the intake stroke onlyC . early part of the injection stroke onlyD . early part of the p

[单选题]"Scavenging" on a diesel engine means （）.A . injecting fuel oil into a cylinderB . removing exhaust gases from the cylinderC . forcing air into the cylinders under pressure after the exhaust valve has dosedD . a combination of all the above

[问答题] 单交（single cross）

[问答题] 复交（multiple cross）

[名词解释] 交叉反应（cross reaction）