7.[基础理论知识]什么是焊接电弧，通常的引弧方法有那二种？
解释信息技术的含义。
中国海运的基本险中不包括（）。 ["战争险","平安险","水渍险","一切险"]
均衡价格
You need to create a new VLAN on your Catalyst switch. This VLAN is to be named TESTKING. Which of the following need to be completed for the creation of this new VLAN?（） [" The TESTKING VLAN must be created."," The desired ports must be added to the new TESTKING VLAN."," The TESTKING VLAN must be added to all of the domains."," The TESTKING VLAN must be named."," An IP address must be configured for the TESTKING VLAN."," None of the above. VLAN creations are automatic."]
简述消毒防腐药作用的因素。
