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【简答题】
对控制系统的框图进行简化,并求其传递函数。
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【简答题】急性毒性试验一般观察时间是（ ）。
【多选题】Bridges and switches are Layer 2 devices that provide the same basic functionality but that also have some differences. Which two traits apply to switches only？（）
A.
supports Layer 2 VLANs
B.
segment LANs
C.
are faster because forwarding decisions are made on hardware
D.
typically have fewer ports because forwarding decisions are made in software
E.
flood frames out all ports