【单选题】【消耗次数：1】
标志的正空间形态与负空间形态互相包含、互相转化，当它们内在地、稳定地联系在一起，任何的增减都会破坏这种稳定性时，冗形就会发生（ ）。
①
变化
②
删除
③
改变
④
转换
参考答案：
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【单选题】
设球面方程为(x一1)2+(y+2)2+(z一3)2=4，则该球的球心坐标与半径分别为( )
①
(一1，2，一3);2
②
(一1，2，-3);4
③
(1，一2，3);2
④
(1，一2，3);4
【判断题】
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正确
②
错误
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①
正确
②
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①
正确
②
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