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闭式水系统有那些用户？

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简述视知觉的特性有哪些。

Bacillus subtilis (Ehrenberg) Cohn 1872

A. 正确
B. 错误

In a lab, two routers are connected directly together using serial interfaces in a back-to-back configuration. No external DCE devices are being used. What additional command is needed to bring this link up?（）

A. serialup
B. clock
C. clockrate
D. dcerate
E. dterate

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