用切除法研究情绪的经典实验是（） ["怒叫中枢","自我刺激","假怒","被动躲避"]
简述1994年美国教育传播与技术协会（AECT）发表的教育技术定义的内容。
砌体工程进行冬期施工时，施工日记应记录的资料应包含（）。 ["A.大气温度 ","B.暖棚内温度 ","C.砌筑时砂浆温度 ","D.外加剂掺量 ","E.同条件下养护28d的试块强度"]
内部环境分析因素包括优势因素和劣势因素，他们是公司在其发展中自身存在的积极和消极因素，属主动因素。
Which of these statements best describes VPLS?（） [" Neither broadcast nor multicast traffic is ever flooded in VPLS."," Multicast traffic is flooded but broadcast traffic is not flooded in VPLS."," VPLS emulates an Ethernet switch, with eachEMS being analogous to a VLAN."," Because U-PE devices act as IEEE 802.1 devices, the VPLS core must use STP."," When the provider experiences an outage, IP re-routing restores PW connectivity and MAC relearning is needed."]
水温对Ro的影响？
