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.
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作面装药过程中属于违章行为的是（）
A. 反向装药
B. 不使用水炮泥、黄炮泥
C. 封泥长度不够
D. 瓦斯超限装药
25Hz相敏轨道电路﹙旧型﹚送电端有扼流变压器时，其电阻R为（）
A. 2.2Ω
B. 2.4Ω
C. 4.2Ω
D. 4.4&Omega
A System p administrator is currently working on a problem with IBM Support. The administrator feels that their expectations are not being met on this problem. What is the IBM recommended procedure to ensure that the request is handled appropriately （）
A. Request to change the severity to 1.
B. Request to speak to the Duty Manager.
C. Request to escalate the problem to development.
D. Call IBM Support again and restart the proce
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