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GB/T 3971.3-1983 The test methods for the technical specifications of multi-frequency register signalling for telephone auto-matic switching network - 英文版 |
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GB/T 3399-1982 Test method for thermal conductivity of plastics by means of the guarded hot plate - 英文版 |
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GB/T 1765-1979 Method of producing of paint films for testing heat and humidity resistance，salt-fog resistance and accelerated weathering - 英文版 |
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