【判断题】【消耗次数：1】
相关系数为+1时，说明两变量安全相关，相关系数为-1时，说明两个变量不相关。
①
正确
②
错误
参考答案：
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to close
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to have closed
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explode
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This record will help your safety officer ----what the problem is
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bring up
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how
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