A.21MPaB.24MPaC.34.5MPaD.35MPa
A.連續(xù)吸油B.間歇吸油C.持續(xù)吸油D.間歇吸氣
A.17.5~21MPaB.17.5~24.5MPaC.24.5~30MPaD.32~48MPa