Access数据库中的查询有很多种，根据每种方式在执行上的不同可以分为选择查询、交叉表查询、 (6) 、 (7) 和SQL查询。
参考答案：参数查询
If a firm announces an unexpectedly large cash dividend, the efficient market hypothesis (EMH) would predict which of the following price changes at the announcement（）
A. An abnormal price change to occur before the announcement.
B. An abnormal price change to occur at the time of the announcement.
C. A gradual price change to occur for several weeks after the announcement.
原发性甲低时，TRH兴奋试验呈（）。
A.过度反应
B.无反应
C.低反应
D.延迟反应
E.以上均不是
