A.Ф10@100/200(4) B.Ф8@100(4)/200(2) C.13Ф10@100/200(4) D.18Ф10@100(4)/200(2)
A.hw≥400mm B.hw>400mm C.hw≥450mm D.hw>450mm
A.2Ф22/(4Ф12) B.2Ф22+(4Ф12) C.2Ф22+4Ф12 D.2Ф22(4Ф12)