A.0.02~0.08sB.0.2~0.4sC.0.4~0.6sD.0.6~1s
A.3~6m/sB.10~20m/sC.30~70m/sD.100~200m/s
A.10~20mpaB.20~30mpaC.300~400mpaD.40~90mpa