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

<ins id="9jyic"></ins>

<blockquote id="9jyic"></blockquote><ruby id="9jyic"><xmp id="9jyic"></xmp></ruby>

<ruby id="9jyic"></ruby>

單項選擇題

Excessive lubricating oil consumption in a running diesel engine can be caused by （）

A.clogged lube oil piping
B.excessive valve-guide clearance
C.high lube oil viscosity
D.low lube oil temperature

你可能感興趣的試題

單項選擇題

If the diesel engine fuel injection timing is changed to delay the start of injection until the pistons are at top dead center, the engine will（）

A.backfire through the air intakes
B.develop less power under load
C.have high firing pressures
D.lift its cylinder relief valves

單項選擇題

A condition that can increase the foaming tendency of lube oil is （）

A.excessively high oil temperatures
B.water or moisture contamination
C.fuel dilution
D.life its cylinder relief vales

<em id="wmwjo"></em>