Article 19: Measures shall be taken to protect against cross contamination of personnel and materials entering or leaving clean rooms (areas) of different cleanliness class.
第十九条不同空气洁净度等级的洁净室(区)之间的人员及物料出入，应有防止交叉污染的措施。
Article 52: the material, style and way of wearing of protective garments shall be appropriate to the requirements of operation and cleanliness class and shall not be otherwise used.
第五十二条工作服的选材、式样及穿戴方式应与生产操作和空气洁净度等级要求相适应，并不得混用。
Probes into the approach to cleanliness abnormality in Class 100 clean room.
探讨在百级洁净室处理洁净度异常问题的思路、方法和手段。
Thee awards run the gamut from 73 categories from best economy class onboard catering to best airline staff to best seats to best cabin cleanliness.
该奖项涵盖范围非常广，包括最佳的经济舱体验、最贴心的空乘服务体验、最舒适的座位体验和最好的机舱清洁度等73个类别。 。
We have the first Class-1000 air cleanliness workshop in China, and parts of its environment can reach Class 100.
我集团公司拥有国内首家1000级无尘车间，其局部生产环境可达到100级。
We have the first Class-1000 air cleanliness workshop in China, and parts of its environment can reach Class 100.
我集团公司拥有国内首家1000级无尘车间，其局部生产环境可达到100级。
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