文秘部门是为领导决策提供（）的主要渠道.
参考答案：信息
One of the assumptions of technical analysis is:（）
A. all analysts have all current information.
B. security prices move in random fashion.
C. supply and demand are driven by rational and irrational behavior.
常用的黑箱测试有等价类划分法、______和错误推测法3种。
