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"]
The Cisco MDS 9000 Series Multilayer SAN Switches can help lower the total cost of ownership ofthe most demanding storage environments. By combining a robust and flexible hardwarearchitecture with multiple layers of network and storage-management intelligence， the Cisco MDS 9000 Series helps you build highly available， scalable storage networks with advanced securityand unified management. What method does the Cisco MDS 9000 Series use to support trunking？（） [" ISL"," VLAN Trunk"," VoQ"," Enhanced ISL"]
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."]
压力容器的主要接头形式是（）接头。 ["对接","搭接","角接","T形"]
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