What are three Cisco Unified CallManager features? ()
A. programming interface to external applications
B. FXS and FXO port negotiation
C. AutoQos VoIP trust boundaries
D. signaling and device control
E. LLQ for voice and video traffic
F. directory and XML service
对于加入转炉的废钢在单重在边长上没有严格要求。()
A. 正确
B. 错误
使用钢筋作为防护栏杆的材料时,钢筋上横杆直径不应小于()。
A. 10mm
B. 12mm
C. 14mm
D. 16mm
要经常注意保持无缝道岔道床的饱满、()及标准的道床断面尺寸。