[单选] 使用（）工具，可以将闭合曲线变为开放曲线。

Part of the job as a network administrator is being able to make a distinction between routed protocols and routing protocols. Which of the following statements is true regarding them?（） A routing protocol is assigned to an interface and determines the method of packet delivery.。 A routed protocol is assigned to an interface and determines the method of packet delivery.。 A routing protocol determines the path of a packet through a network.。 A routed protocol determines the path of a packet through a network.。 A routing protocol operates at the transport layer of the OSI model.。 A routed protocol updates the routing table of a router.。 对变压器套管有哪些要求？ 某企业计划自筹资金，在6年后扩建厂房，估计那时将需要资金1000万元，问从现在开始平均每年应积累资金多少？（利率为6%） 《关于党内政治生活的若干准则》规定，（）是维护党的集中统一的首要条件，是贯彻执行党的路线、方针、政策的根本保证。 什么是政府经济？如何理解政府经济？ 使用（）工具，可以将闭合曲线变为开放曲线。