A.1:2 B.1.5:1 C.1:1.5 D.2:1
A.高出大氣壓的數(shù)值 B.大氣壓的數(shù)值 C.絕對(duì)壓力 D.相對(duì)壓力
A.4.2 B.7 C.8.3 D.9