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

<dl id="qaeqf"></dl>

單項選擇題

A distinguishing feature of an educator, when compared to other pumps, is the （）.

A.dischargeendbeingsmallerthanthesuctionend
B.smallsizeofimpeller
C.lackofmovingparts
D.easeatwhichthewearingringsmaybechanged

你可能感興趣的試題

單項選擇題

The heat required to change a substance from a liquid to a gas without experiencing a temperature change is defined as the latent heat of （）.

A.fusion
B.vaporization
C.sublimation
D.condensation

單項選擇題

Which of the processes listed consumes the greatest amount of power while producing the greatest amount of heat?（）

A.Overcoming sliding friction
B.Overcoming rolling friction
C.Overcoming fluid friction
D.Overcoming oil wedge friction

<pre id="v4nym"><strong id="v4nym"></strong></pre>

<blockquote id="v4nym"></blockquote>