... bullet perforator 子弹射孔器 casing perforator 套管射孔器 perforator character 穿孔机,符号...
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Perforation effect is seriously affected by the clearance between perforator and casing.
射孔枪与套管之间的间隙过大会影响射孔效果，太小容易出现工程事故。
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