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紧固件的表面不连续性。第1部分：一般要求的螺栓，螺钉，螺柱。
Fasteners surface discontinuities; part 1: bolts, screws and studs for general requirements.
youdao
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紧固件的表面不连续性。第1部分：一般要求的螺栓，螺钉，螺柱。
Fasteners surface discontinuities; part 1: bolts, screws and studs for general requirements.
youdao