题目内容

电气管线、给排水管道、设备安装和装修工程的最低保修期为()

A. 6个月
B. 1年
C. 2年
D. 5年

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在旋转机械振动检测与故障诊断中,均方根值诊断法多用于()情况.

钢按碳含量分为<0.25%称为低碳钢0.25~0.60%中碳钢>0.60%高碳钢。

A. 正确
B. 错误

容许速度寺于120千米/小时的线路应设置栅栏封闭,并经常保持完好。

A. 正确
B. 错误

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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