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本文拟研讨1986年高中数学联合竞赛第一试选择题第4小题。题目:如果四面体的每一个面都不是等腰三角形,那么其长度不等的棱的条数最少为 (A)3;(B)4;(C)5;(D)6。
This article is intended to discuss the fourth topic of the first multiple-choice questions for the 1986 High School Mathematics Contest. Title: If every face of a tetrahedron is not an isosceles triangle, then the number of edges of unequal lengths is (A)3; (B)4; (C)5; (D)6.