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Side view of square head bolt with adjustable thread length.
螺纹长度可调整的平头一字槽螺钉的侧面图。
youdao
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This method is practical because the original length of individual bolt is not needed.
该方法无需预知螺栓的初始长度，更为实用。
youdao
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This method is practical because the original length of individual bolt is not needed.
该方法无需预知螺栓的初始长度，更为实用。
youdao