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【单选题】
在具有 n 个单元的顺序存储的循环队列中,假定 front 和 rear 分别为队首指针和队尾指针,则判断队列为空的条件是( )。
A.
front==rear+1
B.
front==rear
C.
front+1==rear
D.
front==0
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