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

<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