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意思解释:(Bore diameter)孔的直径。
机件上圆孔的直径或桥孔、涵洞等的跨度。1876年傅兰雅辑《格致汇编》第一册《算学奇题》:“以球求得句四(八、六、七),即孔径也,亦即钻径。”…
The diameter of round hole on parts or bridge opening, culvert the span that wait. Is Fu Lan elegant 1876 collect does case send collection copy mathematics rare problem : of magnesian Lu of Shan of the Qiu that make Yun smooth with a rake 8, 6, 7) , namely bore diameter also, i.e. gets way. ...
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