[多选] While troubleshooting some connectivity issues，you issue the “show ip ospf database”in order to ex amine the link state database. Which three of the statements below are true regarding the OSPF link state database（）

A . Each router has an identical link state database.
B . External routes are imported into a separate link state database.
C . Syn chronization of link state databases is maintained via floodingo f LSAs.
D . Information in the link state database is used to build a routing table by calculating a shortest-path tree.
E . By default,link state databases are refreshede very 10 minutes in the absence of topology changes.

变压器的吸收比就是（）的比值。 R120与R60。 R60与R120。 R15与R60。 R60与R15。钢支撑体系搭设时，钢支撑距离叠合板支座处应（）。 A.≤200mm 。 B.≤300mm 。 C.≤400mm 。 D.≤500mm。在一定范围内提升声音的高、低频率的电平，可以实现展宽频带、均衡人的听觉感受的音响效果。东方相对独立的三大文化体系不包括下列哪个选项？（）中国文化体系。印度文化体系。阿拉伯-伊斯兰文化体系。日本文化体系。什么是阶梯式凸模冲裁？ While troubleshooting some connectivity issues，you issue the “show ip ospf database”in order to ex amine the link state database. Which three of the statements below are true regarding the OSPF link state database（）

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[多选] While troubleshooting some connectivity issues，you issue the “show ip ospf database”in order to ex amine the link state database. Which three of the statements below are true regarding the OSPF link state database（）

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