
Standard Test Method for Concrete Sewer Manholes by the Negative Air Pressure (Vacuum) Test Prior to Backfill (Metric)
出版:American Society for Testing and Materials

專家解讀視頻
Standard Test Method for Concrete Sewer Manholes by the Negative Air Pressure (Vacuum) Test Prior to Backfill (Metric)
出版:American Society for Testing and Materials
專家解讀視頻