(单选题)1: 设数组A[m]为循环队列Q的存储空间,front为队头指针,rear为队尾指针,则判定Q为空队列的条件是
A: (rear-front)%m= =1
B: front= =rear
C: (rear-front)%m= =m-1
D: front= =(rear+1)%m
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