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热力学三大定律也适用于（）。

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心轨工作边至护轨工作边的最小间距，窄轨道岔规定，900mm轨距不小于（）。

A. 552mm
B. 572mm
C. 574mm
D. 872mm

The network administrator wants to enable an EtherChannel between two switches in "on" mode. The administrator connects the cables and enables the interfaces， but while configuring the EtherChannel in the first switch， a spanning-tree loop was detected. Which two of these procedures can avoid this problem？（）

A. Configure the EtherChannel as "desirable" first.
B. Assign all interfaces to the same VLA
C. Disable PortFast on the interfaces in the EtherChannels.
Disable all interfaces first.
E. Fast Ethernet and Gigabit Ethernet ports cannot be assigned to the same EtherChannel.
Fix cabling problems.

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简单描述冲焊制动器的优点。

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什么是视觉传达设计？包含哪些领域？

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