A.7
B.8
C.9
D.10
A.7
B.8
C.9
D.10
A.6米
B.7米
C.8米
D.9米
A.7
B.8
C.9
D.10
A.6m
B.7m
C.8m
D.9m
A.10m,8kN/m²
B.15m,8kN/m²
C.18m,10kN/m²
D.20m,12kN/m²
A.5,15
B.10,15
C.10,10
D.5,10
A.5,15
B.10,15
C.10,10
D.5,10
A.6m
B.7m
C.8m
D.9m
A.8米
B.7米
C.9米
D.10米