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偏梯形螺紋消失量規(guī)
用來檢驗(yàn)消失螺紋根部以保證外螺紋有足夠的長度并且確為接近消失點(diǎn)螺紋
Measuring the
condition of buttresds-casing thread to make sure enough length of external
thread and knowing that the thread is the thread vanishing point
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