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="arahd"></ins>

<ins id="arahd"></ins>

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

單項(xiàng)選擇題

The centrifugal pump component responsible for converting the mechanical energy of the liquid being pumped, to that of kinetic energy is the （）.

A.electric motor
B.volute
C.impeller
D.diffusion nozzle

你可能感興趣的試題

單項(xiàng)選擇題

In a refrigeration system, foaming of the crankcase oil may cause the （）.

A.expansion valve to overfeed
B.compressor to knock
C.water regulating valve to fail
D.crankcase drains to plug

單項(xiàng)選擇題

Excessive scale formation in a distilling plant may result from （）.

A.poor distillate quality
B.reduced evaporator capacity
C.low brine concentration
D.improper vacuum regulation

<dl id="uylzm"></dl>

<dl id="uylzm"></dl>

<ruby id="uylzm"><output id="uylzm"></output></ruby>

<blockquote id="uylzm"><acronym id="uylzm"></acronym></blockquote>