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

<code id="emmej"><strong id="emmej"></strong></code>

單項選擇題

A lubricant often has to perform many duties in any situation, in addition to its fundamental job of （）.

A.resisting oxidization
B.reducing friction
C.promoting moving speed
D.developing inertia

你可能感興趣的試題

單項選擇題

A level gauge for a tank is to （）.

A.give the pressure
B.give the contents
C.give the shape of the tank
D.give the accuracy level

單項選擇題

A hot air start pipe indicates that there is （）.

A.inefficient cooling
B.a leaking air start valve
C.a clogged drain valve
D.a leaking air bottle

<code id="v7svs"><strong id="v7svs"><input id="v7svs"></input></strong></code>