What formula do you use to calculate the number of Voice Gateway ports? （） ["Erlang A ","Erlang B ","Erlang C ","IVR ports + agent phones &e"]
You are provisioning a DS-1 circuit on an ONS 15454 2F-BLSR with a XC-10G card. Each VT1.5 connection must also terminate via the STS matrix. On the originating circuit node, how many STS ports are now available for VT1.5 circuits?（） ["2","3","4","20","22","24"]
充气阀可以在（）时，能防止工作风缸和降压风缸的压力空气向列车管逆流。 ["一次缓解","阶段缓解","一次缓解和阶段缓解","完全缓解"]
在保护屏上或其附近进行打眼等振动较大的工作时，应采取防止运行中的设备（）的措施，必要时经值班调度或值班负责人同意将保护（）。
下列不属于精神分裂症阳性症状的是（） ["联想障碍","妄想","行为紊乱","情感淡漠","幻觉"]
摩擦副的结构条件：
