問題詳情
12. 設空間中有一點 O 在平面 E 的垂足為 A,直線 L 在平面 E 上,由 A 作直線 L 的垂線交 L 於 B 點,而 L 上另有一點C。若
= 12,
= 13,
= 4,則
長為 (S) 。




參考答案
答案:C
難度:適中0.459016
統計:A(9),B(12),C(28),D(1),E(0)
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