第17题: [单项选择]由于旧城改造,道路拓宽,要涉及大量宗地变更,变更作业步骤是( )。 ①对模拟地图矢量化处理;②首先确定变更范围;③检查出错误并修改;④野外实时测量; ⑤对新测电子图要用软件逐个检查和修改;⑥将变更的数据进行试入库 A. ①②③④⑤⑥ B. ②④①⑤⑥③ C. ②④①⑥⑤③ D. ④③②⑤⑥① 参考答案:B
第18题: [多项选择]What are two reasons for using a virtual link in OSPF?() A. Provides fast convergence times. B. Supports connections of multiple backbones. C. Eliminates the need for a Designated Router. D. Supports non direct connections to the backbone. 参考答案:B,D