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 thrust

B．a breakdown of the lube oil film on the cylinder

C．worn piston boss piston pin bearings

D．fluctuating gas pressure in tile combustion space

[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]China adopted the practice of（ ）in customs clearance following the establis

[名词解释] clearance，C

[单选题](piston area)×(piston stroke)×(numbers of the cylinders)=engine( ).A．brake horsepowerB．displacementC．cylinder volumeD．cylinder clearance

[名词解释] CY-CY

[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

[名词解释] 英译中：Customs clearance

[名词解释] 英译中：Electronic clearance

[问答题] 预检（Pre-clearance）

[单选题]CY-CY运输条款是（）。A . 门-场B . 场-门C . 门-门D . 场-场