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

<tbody id="pmtgi"><p id="pmtgi"></p></tbody>

<dd id="pmtgi"><xmp id="pmtgi"><pre id="pmtgi"></pre></xmp></dd>

單項(xiàng)選擇題

In a refrigeration plant the （） need defrosting.

A.fan
B.compressor
C.condenser
D.evaporator

你可能感興趣的試題

單項(xiàng)選擇題

Hot gas defrosting uses the hot gas from （） to defrost the evaporator.

A.starting air bottles
B.diesel engines
C.boilers
D.refrigeration compressors

單項(xiàng)選擇題

The evaporating pressure in R22 vapor compression refrigeration plant should be （） atmospheric.

A.below
B.above
C.equal to
D.much larger than