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Change log entry 98559
Processed by: richwarm (2026-10-28 20:22:25 UTC)
Comment: << review queue entry 90014 - submitted by 'encn' >>
it's used to define a conic section
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Editor:
2nd sense ~

1) 以牆體的中線為準線,劃定的邊線作垂線。

2) 在牆面彈一立線 ... 彈出牆角抹灰準線,並在準線上下兩端掛通線 ...

3) 基線
1. 製工程圖時,所有量測角度及決定平面或空間點或線相關位置所取之準線稱為基線。
2. ...
https://pedia.cloud.edu.tw/Entry/Detail/?search=%E5%9F%BA%E7%B7%9A&title=%E5%9F%BA%E7%B7%9A
Diff:
- 準線 准线 [zhun3 xian4] /directrix line of a parabola/guide line/
# + 準線 准线 [[zhun3xian4]] /(math.) directrix (of a conic section)/standard; criterion/
 
+ 準線 准线 [[zhun3xian4]] /(math.) directrix (of a conic section)/(engineering, construction etc) reference line/
By MDBG 2026
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