A.1:50; B.1:125; C.1:150; D.1:200;
A.壓力,50%~60%; B.阻力,70%~80%; C.壓力,80%~90%; D.阻力,50%~60%;
A.多塊瓦式; B.筒式; C.楔子板式; D.彈簧式;