... 放大镜（Magnifier） 量齿尺（Perforation Gauge） 胶水纸（Hinge） ...
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perforation-back flowing-pressure gauge testing 射孔
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N a graduated scale for measuring perforations and roulettes of postage stamps (测定邮票齿孔度用的)齿孔尺
The mangle reason of pressure gauge and clock caused by perforation in testing the construction with perforation and the solution ways are described in this paper.
阐述了测试射孔联作施工中，由于射孔造成的压力计及时钟的损坏原因及解决的办法。
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