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

<sup id="qlctg"><pre id="qlctg"><div id="qlctg"></div></pre></sup>

單項選擇題

Because the expansion valve is just （） way open, the refrigerant is under low pressure in the evaporator.

A.little
B.few
C.a little
D.a few

你可能感興趣的試題

單項選擇題

As the refrigerant passes through the valve orifice, its pressure is reduced and part of the refrigerant turns into （）.

A.liquid
B.oily mixture
C.emulsion
D.vapor

單項選擇題

Freon 12 which is used to produce intense cold is normally a （） when at atmospheric pressure and temperature.

A.liquid
B.gas
C.solid
D.water only