A.1/2-2/3 B.1/2-2/5 C.1/3-2/3 D.1/2-3/5
A.0.15~0.25MPa B.0.15~0.35MPa C.0.15~0.45MPa D.0.15~0.55MPa
A.直线运动 B.往复运动 C.上下运动