什么是临界区和临界资源？进程进入临界区的调度原则是什么？
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品牌定位思想是由美国著名的广告经理人（）和（）1972年提出的。
A. 约翰·墨菲；杜纳·科耐铺
B. 艾尔·里斯；杰克·特劳特
C. 布莱克斯通；富尼耶
D. 彼得·法古哈；大卫·艾克
在将档案放入档案架柜时，大多数档案馆采用的档案存放方式为（）。
A. 随意放
B. 平放
C. 竖放
D. 折放
Which two statements are correct regarding multicast implementation using a WLAN controller (v5.2) and AP?（）
A. Multicast traffic is sent out on Cisco APs at the highest mandatory data rate.
B. Multicast traffic is sent out on Cisco APs at the highest supported data rate.
C. On Cisco APs， multicast traffic and beacons are sent out at the same data rates to maintain a common cell size for normal data as well as multicast data.
D. If there is more than one mandatory data rate， multicast traffic will be sent at the highest mandatory rate and beacons will be sent at the lowest mandatory rate.
E. On Cisco APs， multicast traffic will be sent out at the highest data rate that a client can maintain with the A
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