This standard does not cover requirements for flush mounting boxes: however, it covers only those requirements for surface-type mounting boxes which are necessary for the tests on the socket-outlet.
本标准不涉及暗装式安装盒的要求。它只包括插座试验所必须的明装式安装盒的要求。
When replacing the filter materials, the two flange covers shall be opened, and the old filter materials will be discharged from the filter material outlet of the lower end.
更换滤料时，打开两个法兰盖，从下端的滤料出口排出旧滤料。
When replacing the filter materials, the two flange covers shall be opened, and the old filter materials will be discharged from the filter material outlet of the lower end.
更换滤料时，打开两个法兰盖，从下端的滤料出口排出旧滤料。
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