The difference of PC and NC in different economic level group had statistical significance(P<0.001).
不同经济水平组NC、PC的差异都有统计学意义（P<0.001）。
In particular, we should tell the restaurant to improve the overall significance level of service.
特别是要讲清提高餐厅整体服务水平的意义。
In particular, we should tell the restaurant to improve the overall significance level of service.
特别是要讲清提高餐厅整体服务水平的意义。
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