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1 棱柱、棱锥、棱台一、选择题 1.下列命题中正确的有( )。 (1)底面是正多边形的棱锥是正棱锥 (2)侧棱与底面所成角都相等的棱锥是正棱锥 (3)侧棱都相等,底面是正多边形的棱锥是正棱锥 (4)侧棱都相等,侧面与底面所成角都相等的棱锥是正棱锥 (A)0个(B)1个(C)2个(D)3个 2.设M={正四棱柱},N={长方体},P={直四棱柱},Q={正方体}则这些集合
1 Prism, Pyramid, Pyramid, Selective Questions 1. The following propositions are correct (). (1) The bottom surface is a regular polygon. The pyramid is a right pyramid. (2) The side ribs are equal to the bottom. The pyramids are regular pyramids. (3) The side edges are all equal. The bottom surface is a regular polygon. The pyramid is a regular pyramid. (4) The side edges are equal. The pyramids that are equal to the angle formed by the bottom surface are positive pyramids (A) 0 (B) 1 (C) 2 (D) 3 2. Let M = {positive quadratic prism}, N = {cuboid}, P = { Straight quadrilateral}, Q={square} then these sets