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说明: 1.本测试方法适合于国内通用测试,在国际通路中或对外时则按照国际上统一规定的测试方法。2.所有测试方法都是在被测通道处于正
Description: 1. This test method is suitable for domestic general test, in the international access or external in accordance with the provisions of a unified test method. 2. All test methods are positive in the channel under test