机车在任何工况下，当柴油机燃油精滤器出口压力小于（）时，CDID屏显示“燃油压力低”并记录，同时信号集中显示装置“微机报警”指示灯亮，
A. 150kPa
B. 160kPa
C. 170kPa
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企业的民主管理实际上是上层、中层和班组三个层次的管理组成的。
A. 正确
B. 错误
办公建筑的开放式、半开放式办公室，其室内任何一点至最近的安全出口的直线距离不应超过（）m。
A. 20
B. 30
C. 40
D. 50
Which of the listed statements is a characteristic of the liquid charged power element used with thermostatic expansion valves?（）
At the designed operating temperature, the liquid refrigerant charge has changed to a vapor
B. The liquid refrigerant tends to collect at the bellows or diaphragm and reduces the valve sensitivity
C. The sensing bulb is empty of liquid refrigerant charge at the designed operating temperature
D. The sensing bulb is never emptied of liquid refrigerant under normal operating conditio
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