数控系统出现AIR PRESSURE LOW报警表示___________

智慧职教: The low and high pressure compressors include __________ stages which step-by-step increase the pressure of the air.

Air tends to flow from a _______ pressure area to a _______ pressure. A: high, lower B: low, higher C: high, high D: low, low

Either a low injection pressure or a leakage of piston rings is able to lead （）.

Low air pressure inside the funnel of a tornado forms a huge vaccuum.

From the daily service tank,the fuel is pumped to a heater by . A: the transfer pump B: the high pressure pump C: the low pressure fuel pump (or booster ump) D: the separato

Which of the following hydraulic control valves belongs to pressure control valve （ ）. A: Unloading valve B: overflow throttle valve C: Hydraulic control check valve D: Low pressure selector valve

Fog is most commonly associated with a ___ . A: warm front at night B: low pressure area C: anticyclone D: lack of frontal activity

Water attains the boiling temperature quicker in the high elevations than at the low level. Because: A: . the air pressure is lower at high elevations B: . the gravitational force is low in the mountains C: . the sunlight is high in the higher elevations D: . All of them

Generally speaking，with（）the weather becomes cloudy or overcast with strong winds. A: high pressures B: low pressures C: weak pressures D: strong pressure