题目:
---- May we leave the classroom now?
---- No, you _____. You _____ to leave until the bell rings.
A.mustn’t, are allowed
B.can’t, aren’t supposed
C.don’t have to, are supposed
D.needn’t, aren’t allowed
答案:
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题目分析:正方体的内切球的直径为,正方体的棱长,外接球的直径为,正方体的对角线长,设出正方体的棱长,即可求出两个半径,求出半径之比.解:正方体的内切球的直径为,正方体的棱长,外接球的直径为,正方体...