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

單項(xiàng)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

微信掃碼免費(fèi)搜題