A.絕對(duì)氣壓 B.相對(duì)氣壓 C.大氣氣壓 D.空氣氣壓
A.55KPa B.50KPa C.50MPa D.55MPa
A.1.5,2.5% B.3,3.5% C.3.5,4% D.4,4.5%