... contracting system 承发包方式 contracting-expanding nozzle 缩放喷嘴 contraction allowance 收缩留量；收缩公差 ...
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... contracting 收缩的 contracting-expanding nozzle 收缩-膨胀喷管 contraction at fracture 断裂口收缩率 ...
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收敛发散形喷嘴 contracting-expanding nozzle 发散 1.(向四周散开) diffuse; emanate; (of rays, etc.
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