contracting-expanding nozzle的意思|示意

缩放喷嘴 ... contracting system 承发包方式 contracting-expanding nozzle 缩放喷嘴 contraction allowance 收缩留量；收缩公差 ...

收缩 ... contracting 收缩的 contracting-expanding nozzle 收缩-膨胀喷管 contraction at fracture 断裂口收缩率 ...

缩放喷管 缩放喷管: contracting-expanding nozzle; converge..

收敛发散形喷嘴 收敛发散形喷嘴 contracting-expanding nozzle 发散 1.(向四周散开) diffuse; emanate; (of rays, etc.