單項選擇題

If a refrigeration compressor will not start, the reason may be （）.

A.the pressure regulating valve is not closing
B.an excessive lack of refrigerant in the system
C.badly leaking discharge valves
D.worn piston rings

你可能感興趣的試題

單項選擇題

Which of the following statements describes the relationship between flash point and ignition temperature?（）

A.Both are higher than normal burning temperatures
B.The flash point is always higher
C.The ignition temperature is always higher
D.They are not necessarily related

單項選擇題

Flexible hose under pressure in a hydraulic system will （）.

A.tend to twist about its long axis
B.expand in length and in diameter
C.contract in length and expand in diameter
D.flex at right angles to the applied pressure

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

If a refrigeration compressor will not start, the reason may be （）.

你可能感興趣的試題

Which of the following statements describes the relationship between flash point and ignition temperature?（）

Flexible hose under pressure in a hydraulic system will （）.

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