加热器疏水装置的作用是什么？加热器疏水装置有哪两种型式？
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CIP是指运费、目的地交货价。（运费、保险费付至指定目的地）
A. 正确
B. 错误
The OSPF Hello protocol performs which of the following tasks (Choose two.)（）。
A. It provides dynamic neighbor discovery.
B. It detects unreachable neighbors in 90 second intervals.
C. It maintains neighbor relationships.
D. It negotiates correctness parameters between neighboring interfaces.
E. Ituses timers to elect the router with the fastest links as the designated router.
F. It broadcasts hello packets throughout the internetwork to discover all routers that are running OSP
一类高层民用建筑内的商场营业厅，其吊顶应采用（）。（易）
A. 可燃材料
B. 难燃材料
C. 阻燃材料
D. 不燃材料
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