若正棱锥的底面边长与侧棱长都相等，则该棱锥一定不是 �

若正棱锥的底面边长与侧棱长都相等，则该棱锥一定不是（）

A．三棱锥 B．四棱锥 C．五棱锥 D．六棱锥

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若正棱锥的底面边长与侧棱长都相等，则该棱锥一定不是 �

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