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https://investors.att.com/~/media/Files/A/ATT-IR/financial-reports/annual-reports/2017/complete-2017-annual-report.pdf
您即将离开知乎,请注意您的帐号和财产安全。
https://investors.att.com/~/media/Files/A/ATT-IR/financial-reports/annual-reports/2017/complete-2017-annual-report.pdf