surfacen.表面；外表；平面adj.表面的；肤浅的vt.在 ... 上加表层；使 ... 成平面vi.浮到水面；显露；在表面工作surface oxide表面氧化物

1. A cylindrical and conical composite horn is designed theoretically to improve its shape coefficient, increase its amplification factor and so on.
   摘要为了改善变幅杆的形状因数，增加放大系数，用解析法设计了一种圆锥过渡复合变幅杆，计算了它的动力学参数。