97免费在线观看视频,亚洲综合自拍网,黄色毛片免费观看,热久久综合网,免费看日产一区二区三区狠狠操av,久久久涩涩涩,在线精品免费视频,人人插天天干,久久91精品国产91久久

<dd id="qjslz"></dd>

<ruby id="qjslz"><output id="qjslz"></output></ruby>

單項選擇題

Which of the following problems represent one possible cause of high lube oil consumption in a four stroke diesel engine?（）

A.Worn intake valve guides
B.Pitted pre-combustion chambers
C.Loose valve tappets
D.High exhaust back pressure

你可能感興趣的試題

單項選擇題

Late fuel oil injection in a diesel engine can result in （）

A.fuel knock
B.increased power
C.low compression pressure
D.high exhaust temperature

單項選擇題

A crankshaft whose center of gravity coincides with its center line is said to be（）
Ⅰ.statically balanced
Ⅱ.dynamically balanced

A.Ⅰ only
B.Ⅱ only
C.both Ⅰ and Ⅱ
D.neither Ⅰ nor Ⅱ