A.為4~3 B.為3~2 C.為2~1 D.≤1
Dc=1.3×1.10/1.20=1.19,1.19<1.88預(yù)計(jì)是異常高壓
2541.2+4.6-2537.4=8.4m, 2537.4-2535.8-0.05=1.55m。