Which of the following are benefits of VLANs?（）
A. They increase the size of collision domains.
B. They allow logical grouping of users by function.
C. They can enhance network security,
D. The increase the size of broadcast domains while decreasing the number of the broadcast domains.
E. The increase the number of broadcast domains while decreasing the size of the broadcast domains.
F. They simplify switch administration.
查看答案
长期设动成本定价法是（）的定价方法。
A. 以长期变动成本为高限
B. 以长期固定成本与变动成本之和为低限
C. 以固定成本为低限
D. 以长期变动成本为低限，以长期变动成本加上某一比例为高限
某婴儿，日龄16日。近2日口腔黏膜上有白色如凝块样物，强拭去可见红色疮面，吃奶好，睡眠佳。可能的诊断是（）。
A. 鹅口疮
B. 疱疹性口腔炎
C. 溃疡性口腔炎
D. 单纯性口腔炎
E. 麻疹黏膜斑
You have an Exchange organization that contains Exchange 2000 Server Service Pack 3 （SP3）， Exchange Server 2003 Service Pack 2 （SP2）， and Exchange Server 2007 Service Pack 1 （SP1） servers. You need to transition the organization to Exchange Server 2010. What should you do first？（）
A. Remove all Exchange Server 2007 SP1 servers from the organization.
B. Remove all Exchange 2000 Server and all Exchange Server 2003 servers from the organization.
C. Remove all Exchange 2000 Server servers from the organization，and then upgrade all Exchange server 2007 servers to SP2.
D. Remove all Exchange Server 2003 servers from the organization，and then upgrade all Exchange server 2007 servers to SP2.
微信支付 
支付宝支付