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="xscxj"><output id="xscxj"></output></ins>

<pre id="xscxj"><acronym id="xscxj"><div id="xscxj"></div></acronym></pre><dd id="xscxj"></dd>

單項(xiàng)選擇題

Additional heat extraction from the exhaust gases can be effected by adding an （） section to the unit in plants.

A.air cooler
B.economizer
C.injector
D.air blower

你可能感興趣的試題

單項(xiàng)選擇題

Oil water separators are used to ensure that ships don’t discharge oil when （） bilge water.

A.to pump off
B.being pumped
C.pumping out
D.it pumping out

單項(xiàng)選擇題

In general, （） is suitable for delivering small quantifies at high pressure.

A.reciprocating pump
B.gear pump
C.centrifugal pump
D.vane pump

<blockquote id="ny0kl"></blockquote>

<ruby id="ny0kl"><output id="ny0kl"></output></ruby>

<ruby id="ny0kl"><output id="ny0kl"></output></ruby>

<ruby id="ny0kl"><output id="ny0kl"></output></ruby>

<dd id="ny0kl"></dd>