当建筑基坑采用排桩、地下连续墙锚杆结构时，锚杆长度设计应符合一定的构造要求，下述（）是正确的。（）
A. 锚杆体下料长度应为自由段，锚固段及外露长度之和
B. 土层锚杆锚固段长度不宜小于6.0m
C. 锚杆自由段长度不宜小于5m
D. 自由段长度应超过潜在滑面1.5m
While using the WebSphere Commerce Accelerator to manage a Hosting hub， which of the following tasks could a Channel Manager perform？（）
A. Open and close a store
B. List distributors for the hub
C. Broadcast e-mail to customers of the hub
D. Manage campaigns
E. Create new users or change user attribute
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