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

According to the way the energy of the exhaust gases is utilized, pressure-charging can be divided into two main systems, namely, the constant-pressure system and （）.

A.the pulse-phase system
B.the pulse Doppler system
C.the pulse system
D.the pulse interval

你可能感興趣的試題

單項(xiàng)選擇題

About half an hour before the engine is required, cooling water at （） must be circulated.

A.more than the working temperature
B.less than the working temperature
C.the working temperature
D.the same as the surrounding temperature

單項(xiàng)選擇題

A: Please tell me the specifications and quantity.
B: （）

A.Pump diesel oil first
B.300 tons of 180 cst fuel oil
C.The figure is all right
D.OK, I’ll sign it