A . the scavenging air
B . the exhaust gases
C . the mixed air
D . the spray oil
[单选题]Passages are drilled in the crankshafts of diesel engines to provide lubricating oil to the ().A . main bearingsB . connecting rod bearingsC . piston pin bushingsD . All of the above
[单选题]The cylinder liners are made of _____ and the cylinder surfaces are sometimes chromium-plated.A.steelB.copperC.cast ironD.stainless steel
[单选题]The withdrawing of the cylinder liners, in general, depends on their ().This may amount to approximately 1/120 of the diameter in some engines.A . correct maneuveringB . wearC . working efficiencyD . maintenance
[单选题]A number of cylinder liners are enclosed in one cast iron casing to form a ().A . cylinder coverB . cylinder blockC . cylinder frameD . bed-plate
[单选题]The cylinder liners are made of () and the cylinder surfaces are sometimes chromium-plated.A . steelB . copperC . cast ironD . stainless steel
[单选题]The cylinder covers and the liners are bolted together by means of ().A . bolts welded into the cylinder headB . bolts welded into the cylinder framesC . studs screwed into the cylinder headD . studs screwed into the cylinder frame
[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]The author mentions the ports of Los Angeles and Long Beach to ______.[A]prove they are the largest ports in the United States[B]demonstrate they create many new job opportunities[C]highlight that shipping is less glamorous than making movies[D]empha
[多选题] 有关Ports正确的是()A . 是套接字的一部分B . 可以设置的范围为1~1024C . HTTP服务的端口号为80D . 是协议设置好的,不能认为改动
[单选题]As the plunger moves up, the ports are closed and the fuel () and delivered to the injector nozzle at very high pressure.A . being compressedB . to be pumped upC . is pressurizedD . are built u