[问答题] 试述农产品市场的特殊性。

Tiered disk systems （DS8700 and DS5020）， tape backup and Cisco director（s） utilizing VSANs have been proposed as a solution. The storage specialist is asked to explain the technical advantage of using Cisco directors and VSANs.  Which of the following is the key point to stress to the customer（） ["a single director and VSANs provides redundant fabrics at reasonable cost","prevent disk and tape traffic from sharing a host port","ease of implementation of Administrative Domains","ability to easily create a DS8700 LPAR to send data directly to tape"] 宜耕期 Which of the following DB2 tools allows a user to execute an SQL statement and view a graphical representation of the access plan?（） ["Task Center","Command Editor","Developer Workbench","Command Line Processor"] 以下哪个产品不是物理磁带库（） ["TS2240","TS3310","TS3400","TS7700"] 将同类指标不同时期的数值进行对比，求出比率，以分析该项指标的发展方向和发展速度的方法是（）。 ["结构比率法","相关比率法","动态比率法","构成比率法"] 试述农产品市场的特殊性。