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海南省海口市四月初高考调研测试卷理科第(14)题(文科第4题):“关于平面向量a,b,c,有下列四个命题:
Hainan Province, Haikou City, early April entrance examination investigation and management science (14) (Arts 4): ”on the plane vector a, b, c, the following four propositions: