当用户增多并达到小区所能服务的最大限度时,如果把这些小区分割成更小的蜂窝状区域,并相应减小新小区的发射功率和采用相同的频率再用模式,这种过程称为()。
参考答案:小区分裂
Questions and exercises are given by the computer, which decides ______ to move the students ahead, review an easier level, ____ give more work on the same level.
A.either, or
B.both, and .
C.whether, or
D.not only, but also
美人鱼虽然有人一样的眼睛可是没有眼泪。