A.L≥1.9m B.L≥3.9m C.L≥7m D.≥6.7m
A.K=0.55 B.K=1.80 C.K=2.37 D.K=4.28
A.1.6m;140kPa B.1.9m;140kPa C.1.9m;120kPa D.2.2m;110kPa