Analyzes that the indexes of purification technology affect and act mutually, and finally affects the operation quality of the clean operating department.

分析了洁净技术指标相互影响，相互作用，最终影响洁净手术部手术质量。

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That's because his mother's South Bronx building is one of thousands of private dwellings patrolled by the New York Police Department under a program known as Operation Clean Halls.

WSJ: NYPD program patrols inside private buildings