知:縱波速度Vp=3600m/s,橫波速度Vs=2000m/s,求:σ=?
知:h1=1000m,h2=1000m,h3=1000m,V1=3000m/s,V2=3500m/s,V3=4000m/s求:Vr=?(取整數(shù))