低压配电点或装有3台以上电气设备的地点,必须装设()接地极。
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Which three factors have the biggest influence on OSPF scalability?()
A. Flooding paths and redundancy
B. Amount of routing information in the OSPF area or routing domain
C. Number of routers with Cisco Express Forwarding enabled
D. Number of neighbor adjacencies
E. Other routing protocols in use
F. OSPF timer reconstruction negotiation
G. Redistribution with BGP neighbors
H. Redistribution with other IGP routing protocols, such as RIP or EIGRP
水稻湿润育秧中,为什么强调培育壮秧?壮秧的形态与生理特征有哪些?
阀门填料密封泄漏不大时,要()。
A. 开大阀门
B. 紧固法兰盖
C. 阀杆加油
肺结核病是由哪种途径传播的?()
A. 消化道传播
B. 呼吸道传播
C. 虫媒传播