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1 以三線規量測M8×1之螺紋時,若選用0.6mm之鋼線,分厘卡之量測值為8.28mm,則螺紋之節徑為
A ψ9.214mm
B ψ9.136mm
C ψ8.924mm
D ψ7.346mm
E=M+0.866P-3G=8.28+0.866×1-3×0.6=7.346(mm) 。