一般在霰弹枪枪管口部有一小段内膛尺寸缩小的部位，这就是缩口，又称为喉缩。
... thermomechanical necking 热机械面收缩现象 localized necking 局部颈缩 necking down 缩口 ; 收缩 ; ...
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... 衬圈 gas ket 缩口 contraction end for joggle 多孔填料 porous mass ...
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缩口模 necking dies ; neckling die ; reducing die
缩口系数 [机] necking coefficient
冷缩口机 cold-reducing mill ; cold-reducing machine
缩口阀门 reduced-bore valve
缩口用压力机 reducing press
钢管扩口缩口机 Pipe flaring pointing machine ; Pipe flaring necking machine
聚四氟乙烯缩口瓶 Teflon reducing bottle
缩口型燃烧室 reentrant combustion chambers
分析了火焰管缩口的变形特点。
The deformation characteristic of the flame pipe necking was analyzed.
介绍了前横梁管材缩口机的原理及结构。
It has been introduced the principle and structure of necking machine for the front cross member pipe.
采用缩口的接触型式，能获得满意的电阻焊接头。
A choke shape design is used for obtaining the satisfactory weld joint.
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