无码高清视频|成人自拍视频|欧美成人午夜无码A片秀色直播|草美女视频网站|美女被操网站在线观看

單項(xiàng)選擇題

（） are more suitable for large quantities at low pressure.

A.Reciprocating pumps
B.Rotary pumps
C.Centrifugal pumps
D.Gear pumps

你可能感興趣的試題

單項(xiàng)選擇題

The various pumps and lines are （） to some extent so that each pump can act as an alternative for another.

A.interlocked
B.interconnected
C.interfered
D.interacted

單項(xiàng)選擇題

According to the way the steering gear is operated, the steering gear may be divided into: hand - steering, （） and automatic steering.

A.hydraulic steering
B.follow-up steering
C.remote control steering
D.air controlled steering

<pre id="eanyt"><strong id="eanyt"></strong></pre>