superficial gas velocity 基本例句 表观气速 The study used relatively small values ofsuperficial gas velocity.这项研究采用相当小的表观气速。 The average particle velocity and concentration for the flotsam and the jetsam were unequal in the radial and axial directions.随着表观气速的增大,颗粒浓度沿径向和床高分布趋于均匀。