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使用手电钻时应采取哪些安全措施？

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什么是损害赔偿责任？

In a customer’s network， VLAN Trunking Protocol （VTP） is running with a domain named main1. VLANs 1，2，3，4，5，10，20 are active on the network. Suddenly the whole network goes down. No traffic is being passed on VLANs 2，3，4，5，10，20， however traffic passes on VLAN 1 and indicates all switches are operational. Right before the network problem occurred， a switch named TEST1 was added to the network. What three configuration issues on TEST1 could be causing the network outage？（）

A. TEST1 is configured as a VTP server with a different domain name.
B. TEST1 is not configured to participate in VT
C. TEST1 is configured as a VTP server with the domain name main1.
D. TEST1 has a lower VTP configuration revision than the current VTP revision.
E. TEST1 has a higher VTP configuration revision than the current VTP revision.
F. TEST1 is configured with only VLAN1.

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按照流水线中是否有反馈回路来对流水线进行分类，可分为（）和（）。

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天然气（）、无味、无毒且无腐蚀性，主要成分以（）为主。

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