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道琼斯公用事业平均指数
Dow Jones Utility Average
道琼斯公用事业平均指数
DJUA
防火墙不仅能防止无用访问、而且能通过开放的公共网络、如互联网、建立安全通道
Firewalls not only guard against unwanted access, they can also be used to create a secure channel through an open public network, like the Internet
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