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

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

<ruby id="snpet"><xmp id="snpet"></xmp></ruby>

<dd id="snpet"></dd>

<dd id="snpet"></dd>

單項選擇題

The selection of a lubricating oil depends to a great extent on the operating conditions,（）.

A.the type of coolant
B.the design of the engine
C.the type of fuel to be burned
D.B and C

你可能感興趣的試題

單項選擇題

The sealing rings are in four parts and pressed together around the piston rods by means of （）.

A.nuts
B.bolts
C.coil springs
D.stuffing boxes

單項選擇題

The scavenging box is built of a number of sections provided with vertical flanges enabling them （） together to form two blocks.

A.being bolted
B.bolted
C.bolting
D.to be bolted

<ruby id="zm6kr"><xmp id="zm6kr"></xmp></ruby>