【单选题】下面关于关系数据库视图的描述,不正确的是()。
C.
创建视图的SELECT命令不可以包括ORDER BY子句或INTO子句
【单选题】下面关于关系数据库视图的描述不正确的是( )。
【单选题】You are developing a Windows Presentation Foundation (WPF) application.You need to display HTML content from a Web page on the WPF form. What should you do?()
A.
Add a FlowDocumentReader control to the design surface. Then create a FlowDocument control.
B.
Add a DocumentViewer control to the design surface. Then create a FixedDocument control.
C.
Add a WebBrowser control to the design surface. Then use the Navigate method to navigate the URI object.
D.
Add a ContentControl control to the design surface. Then reference a WebClient object to return an HTML string.
【单选题】One end of a diesel engine cylinder is sealed by the cylinder head and the other end by the ___________.
【简答题】webbrowser.navigate "www.baidu.com"实现的功能是?
【单选题】视图是各种关系数据库应用较为成熟的技术,对于安的描述,下面正确的是()。
B.
B 视图是一种特殊的表,同数据库设计人员或程序定义,它存在于数据库中
C.
C 从视图中查询数据与从表中查询数据的结果不一致
D.
D 使用视图可以提高数据安全性,但是它会降低系统性能
【单选题】The______ diameter is expanded to contact the brake surface by a hydraulic cylinder that is referred to as a wheel cylinder.
【单选题】The main factor determining the output of each cylinder is the cylinder _____.