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目的：检测1号止回阀对于回流的密封性。
Purpose: To test valve No. 1 for tightness against reverse flow.
youdao
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目的：检测止回阀2号对于回流的密封性。
Purpose: To test check valve No. 2 for tightness against reverse flow.
youdao
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目的：检测止回阀2号对于回流的密封性。
Purpose: To test check valve No. 2 for tightness against reverse flow.
youdao