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【多选题】
有关移动通信中覆盖小区说法正确的是（ ）A.
小区形状的设计要求：小区无空隙、无重叠的覆盖整个服务区域。
B.
在考虑交叠之后，实际上每个辐射区的有效覆盖一个多边形。满足无空隙、无重叠条件的小区形状有三种：正三角形、正方形和正六边形。
C.
在服务区面积一定的情况下，正六边形小区的形状最接近理想的圆形，用它覆盖整个服务区所需的基站数最少，也就最经济
D.
天线辐射的覆盖圆形，不能无空隙、无重叠的覆盖整个区域。
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A.
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D.
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A.
allow a ball played toward them to bounce one time on their side of the table
B.
return it so that it bounces on the opposite side at least once
C.
spinning the ball to limit the opponent's options
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