2026-4-2 10.1.127.236
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GB/T 7676.1-1987 Direct acting indicating analogue electrical measuring instruments and their accessories--Definitions and general requirements common to all parts 
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GB/T 7674-1987 SF6 gas-insulated metal-enclosed switchgear 
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GB/T 7664-1987 Specifications for Vickers hardness testers 
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GB/T 7635-1987  
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GB/T 7663-1987 Standardized blocks of Vickers hardness 
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GB/T 7576-1987 Blank detail specification for case-rated bipolar transistors for high-frequency amplification 
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GB/T 7611-1987 Parameters of digital interface for PCM systems over telecommunication network 
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GB/T 7563-1987 Qualty of coal for cement rotary kiln 
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GB/T 7562-1987 Quality specification of coal used for pulverized coal-fired boiler for power generation 
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GB/T 755-1987 General requirements for rotating electrical machines 
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GB/T 7551-1987 Resistance strain gage load cells 
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GB/T 7453-1987 Measurement of ship vibration 
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GB/T 7462-1987 Surface active agents--Measurement of foaming power--Modified Ross-Miles method 
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GB/T 7452-1987 Guidelines for the evaluation of ship vibration 
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GB/T 7437-1987 The transmission performance objectives for public analogue toll telephone automatic switching network 
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GB/T 7426-1987 Recorded characteristic for magnetic sound records on 16mm motion-picture film containing no picture 
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GB/T 7431-1987 Transmission objectives and their testing methods for crossbar local automatic telephone exchange 
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GB/T 7407-1987 Codes for China and world main shipping trade ports 
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GB/T 7424-1987  
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GB/T 7400.11-1987 Broadcasting and television terminology--Television broadcasting--Digital 
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