What is the purpose of the cisco Vlan Trunking protocol?（）
A. to provide a mechanism to dynamically assign vlan membership to switch ports
B. to allow traffic to be carried from multiple vlans over a single link between switches
C. to allow native vlan information to be carried over a trunk link
D. to provide a mechanism to manually assign vlan membership to switch ports
E. to allow for managing the additions,deletions,and changes of vlans between switch
某礼堂轴线尺寸为40m×50m，墙厚均为240m，设有四个门口，门口宽度为3m，采用水磨石整体面层装修。根据《广东省建筑与装饰工程综合定额》(2010)，该礼堂水磨石整体面层的工程量为()㎡
A. 2008.64
B. 2000
C. 1987.10
D. 1978.46
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