A . during the valve overlap period
B . with only the exhaust valve open
C . at a pressure below atmospheric
D . without cooling the cylinders or pisto
[单选题]China adopted the practice of( )in customs clearance following the establis
[名词解释] clearance,C
[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]Cross scavenging requires the fitting of () to prevent air or exhaust gas escape when the piston is at the top of the stroke.A . a exhaust valveB . a piston skirtC . a piston crownD . an air suction valve
[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]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]If clearance between a piston and the cylinder wall is excessive, piston slap will occur. The slap itself is caused by_____.A.alternation of side thrustB.a breakdown of the lube oil film on the cylinderC.worn piston boss piston pin bearingsD.fluctuat
[单选题]Increasing the valve clearance between a valve stem and rocker arm, will result in the valve ()A . closing laterB . opening soonerC . staying open for a shorter period of timeD . staying open for a longer period of time
[单选题]()is the volume for loading goods of the vehicle.A . Vehicle tonnageB . Vehicle sizeC . Vehicle capacityD . Available vehicle capacity
[单选题]Volume Box指的是( )。A.棋盘式准直器B.独立准直器C.孔雀系统准直器D.非独立准直器E.多叶准直器