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

<ins id="9n7zc"></ins>

<dl id="9n7zc"></dl>

單項(xiàng)選擇題

A mixed-flow pump is a （） pump classified by the working principle.

A.self priming
B.positive displacement
C.reciprocating
D.impeller

你可能感興趣的試題

單項(xiàng)選擇題

The （）pump is usually used as the bilge feed pump to an oily water separator.

A.turbine
B.screw
C.vane
D.ejector

單項(xiàng)選擇題

The （）pump is usually used as the emergency bilge pump.

A.turbine
B.screw
C.vane
D.ejector

<pre id="wp5mq"><acronym id="wp5mq"></acronym></pre>

<pre id="wp5mq"><strong id="wp5mq"></strong></pre>

<dd id="wp5mq"></dd>

<pre id="wp5mq"><strong id="wp5mq"></strong></pre>