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

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

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

<dd id="prggs"></dd>

單項(xiàng)選擇題

In the （） refrigeration compressor one end of the crank shaft extends through the crankcase house for connection, via a coupling or pulley, to an external drive motor.

A.open-type
B.hermetic
C.semi-hermetic
D.all the above

你可能感興趣的試題

單項(xiàng)選擇題

Which of the following will be desirable properties of refrigerant?（）
(1) non-explosive
(2) non-corrosive
(3) that it doesn’t react with lubricants

A.(1), (2) and (3)
B.(1) and (2)
C.(1) and (3)
D.(2) and (3)

單項(xiàng)選擇題

In practice, the refrigerant flow after the evaporator is designed to ensure that the vapor leaving the evaporator is slightly （）.

A.saturated
B.super-cooled
C.wet
D.superheated

<ins id="evmws"></ins>

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