A.D孔=D-P B.D孔=D-1.05P C.D孔=D-1.0825P D.D孔=D-1.13P
A.P=Ph B.Ph=nP C.P=nPh D.不能確定
A.tAnα/2=(D-d)/(2L) B.C=(D-d)/L C.S=(D-d)L0/(2L) D.S=(D-d)L0/(L)