【单选题】【消耗次数：1】
从变量之间相关的表现形式看，可分为?
①
正相关与负相关
②
直线相关和曲线相关
③
单相关与复相关
④
完全相关和无相关
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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①
正确
②
错误
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①
正确
②
错误
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①
正确
②
错误
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①
正确
②
错误
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①
正确
②
错误
【判断题】
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①
正确
②
错误
【判断题】
These two chemicals ____interact_____ with each other at a certain temperature to produce a substance which could cause an explosion.
①
正确
②
错误
【判断题】
Dashan, who ___has been learning___ crosstalk, the Chinese comedic tradition, for decades, wants to mix it up with the Western stand-up tradition.
①
正确
②
错误