A.≤DC1.5V B.≥DC1.5V C.≤DC2V D.≥DC2V
A.DC12V B.DC24V C.AC24V D.AC220V
A.0.45MPa~0.6MPa B.0.5MPa~0.65MPa C.0.6MPa~0.65MPa D.0.6MPa~0.7MPa