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operators'characteristic value-added telecommunication service
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operators'characteristic value-added telecommunication service
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operators'characteristic value-added telecommunication service
运营商特色增值电信业务
凭借公用电信网的资源和其他通信设备而开发的附加通信业务和信息服务业务。
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vacuum fluorescence
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vacuum heat treatment technology
vacuum impregnating
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vacuum infiltration transformation
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vacuum metallizing plant
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