问题：
[多选题]The LAN needs are expanding at the Testking corporate office, which is quickly growing. You are instructed to enlarge the area covered by a single LAN segment on the TestKing network.Which of the following are layer 1 devices that you can use?（）
A、A switch.
B、A router.
C、A network adapter card.
D、A hub.
E、A repeater.
参考答案：
D | E
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