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【单选题】
年劳动生产率x(千元)和职工工资Y(元)之间的回归方程为Y=10+70x。这意味着年劳动生产率每提高1千元时,职工工资平均( )。
A.
增加70元
B.
减少70元
C.
增加80元
D.
减少80元
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