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This standard specifies the water quality index, water quality classification, standard limit, water quality inspection and superv
In order to ensure the production and safety of urban ferry passenger transport, the communication equipment configuration standar
This standard aims to protect the safety of people and animals so as to encourage visitors and animal managers to respond as quick
CJ 39.4-1991 Calculation Method of Economic and Technical Indicators of Urban Public Transport Subway CJ39.4-91 CJ39.4-1991 Standa
CJ 39.3-1991 Calculation Method of Economic and Technical Indicators of Urban Public Transport Passenger Ferry CJ39.3-91 CJ39.3-19
CJ 39.1-1991 Calculation method of economic and technical indicators of urban public transportation Buses and trams CJ39.1-91 CJ39
CJ 28.3-1991 Graphical symbols for environmental sanitation facilities and equipment Machinery and equipment CJ28.3-91 CJ28.3-1991
CJ 28.1-1991 Graphical symbols for environmental sanitation facilities and equipment Facility signs CJ28.1-91 CJ28.1-1991 Standard