题目

在三棱锥中，侧面、侧面、侧两两互相垂直，且，设三棱锥的体积为，三棱锥的外接球的体积为，则（     ） A．            B． C．              D． 答案：ASome people argue that both the government and the milk producers are __________ for the deathof the babies．A.blamedB.blamingC.to be blamedD.to blame