2.若三棱锥的顶点在底面内的射影恰是底面三角形的垂心则 A.三条侧棱的长都相等 B.三个侧面与底面所成的角都相等 C.三条侧棱必两两 Template




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tomski2.若三棱锥的顶点在底面内的射影恰是底面三角形的垂心则 a.三条侧棱的长都相等 b.三个侧面与底面所成的角都相等 coloring