A.0.5~1.0m B.1~1.5m C.1.5~2.0m D.2.0m
A.排污 B.空氣置換 C.強(qiáng)度試壓 D.以上都不對(duì)
A.0.05~0.1 B.0.1~0.3 C.0.15~0.35 D.0.5~1.0