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IPA-3400 \u6700\u591a\u53ef\u5bb9\u7eb3 4 \u4e2a IPA-3900-FM \u6d41\u91cf\u6a21\u5757\u3002<\/p>\n
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IPA-3400 \u53ef\u8bc6\u522b\u5b83\u4eec\uff0c\u5176\u5e8f\u5217\u53f7\u548c NIST<\/p>\n
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IPA \u6d4b\u8bd5\u7cfb\u7edf\u7684\u7075\u6d3b\u6027\u3002\u5f53<\/p>\n
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<\/p>\n
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