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

<pre id="tjwi7"><acronym id="tjwi7"></acronym></pre>

<ruby id="tjwi7"><small id="tjwi7"></small></ruby>

單項(xiàng)選擇題

When securing a flash-type evaporator for an extended period of time, you should （）.

A.fill the unit with saltwater
B.fill the unit with de-scaling compound
C.completely drain the unit
D.tightly seal the unit to exclude air

你可能感興趣的試題

單項(xiàng)選擇題

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

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

單項(xiàng)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

<pre id="q0292"><strong id="q0292"></strong></pre>

<blockquote id="q0292"></blockquote>