问答题

巡检的职能有、、、、。

答案： (1)
巡逻 ...

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多项选择题

以下哪两个为PoE的供电标准（）？(Select 2 Answers)
A、IEEE 802.3ae
B、IEEE 802.3af
C、IEEE 802.3as
D、IEEE 802.3at

单项选择题

What should the speaker talk about in his/her speech?
A、Sth that audience are interested in.
B、Sth the audience wants to hear.
C、Sth valuable to the audience
D、All of the above.