A.0.8m B.0.6m C.1.0m D.1.2m
A.5 B.10 C.15 D.20
A.天窗修 B.管理一致 C.检修分开 D.检修一致
A.f=L/(8R) B.f=L2/R C.f=L/R D.f=L2/(8R)
A.1100 B.1200 C.1400 D.1500