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

<pre id="fegdh"><pre id="fegdh"><div id="fegdh"></div></pre></pre>

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

<pre id="fegdh"><strong id="fegdh"><cite id="fegdh"></cite></strong></pre>

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

單項選擇題

What type of valve is used to direct the flow of hydraulic fluid?（）

A.Relief valve
B.Direction control valve
C.Stop valve
D.Pressure control valve

你可能感興趣的試題

單項選擇題

The rotor of the hydraulic motor rotates at a speed proportional to the （）.

A.flow of oil
B.pressure of oil
C.A and B
D.temperature of oil

單項選擇題

（） are used to limit the pressure in any particular portion and mainly control the pressure after the valve.

A.Relief valves
B.Check valves
C.Safety valves
D.Reducing valve