99色精品-9色在线-99色在线-99色视频国产欧美日产一区二区三区_亚洲精品亚洲人成在线观看_四虎在线精品永久观看_免费一级a一片久久精

<blockquote id="mnloh"><pre id="mnloh"><div id="mnloh"></div></pre></blockquote><ins id="mnloh"></ins>

<b id="mnloh"><pre id="mnloh"></pre></b><pre id="mnloh"><legend id="mnloh"></legend></pre>

單項(xiàng)選擇題

When distilling sea water the cooling water discharging from the distiller is fed back to evaporator as feed water （）.

A.to decrease scale formation
B.for better cooling effect
C.for more economical purpose
D.to raise vacuum

你可能感興趣的試題

單項(xiàng)選擇題

In a vacuum boiling evaporator, the fresh water generated is pumped out by （）.

A.a brine pump
B.an air ejector
C.a feed water pump
D.a condensate pump

單項(xiàng)選擇題

With a vacuum boiling evaporator, the remainder of sea water fed to the evaporator is pumped out by （）.

A.a brine pump
B.an air ejector
C.a feed pump
D.distillate pump