单纯性囊肿的诊断标准错误的是（）
A.内部为无回声
B.壁薄而光滑
C.后壁回声清晰
D.后方回声增强
E.较厚的分隔
参考答案：E
A "nationally syndicated television show" underlined in Paragraph 1 is most possibly a TV show that ______.
A．can be organized like a national game
B．can be aired in many towns in the USA
C．might be somehow eradicated someday
D．must be shown everywhere across the country
如果对关系emp（eno，ename，salary）成功执行下面的SQL语句：CREATE CLUSTER INDEX name_index ON emp（salary） 对此结果的正确描述是
A．在emp表上按salary升序创建了一个聚簇索引
B．在emp表上按salary降序创建了一个聚簇索引
C．在emp表上按salary升序创建了一个唯一索引
D．在emp表上按salary降序创建了一个唯一索引
