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

<ins id="1zdhl"><output id="1zdhl"></output></ins>

<dl id="1zdhl"><xmp id="1zdhl">

<dd id="1zdhl"></dd>

單項(xiàng)選擇題

（） is used for sensing the temperature of the room in the air condition system.

A.An expansion valve
B.An evaporator
C.A thermostat
D.A condenser

你可能感興趣的試題

單項(xiàng)選擇題

The control spindle operates the slipper ring or （） of the variable delivery pump, which controls the suction and discharge of the oil.

A.servo-motor
B.swash plate
C.plunger
D.cylinder

單項(xiàng)選擇題

Where tanks are arranged for either oil or ballast, （） must be fitted in the pipeline.

A.a change-over chest
B.a head tank
C.a emergency bilge pump
D.an air cooler