报章文体怎样形成，有何特点。
Which are the two modes for the installation of Windows 2000 professional. （） Interactive and Network mode.。 Attended and unattended mode.。 Diskless and floppy mode.。 User level and administrator level mode.。
铁合金煤气回收时，严禁随意打开（）观察炉内情况。 泄爆装置。 炉门。 烟道。
投标人之间协商投标报价等投标文件的实质性内容、约定中标人等行为属于投标人相互串通投标。
You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. You write the following code segment. (Line numbers are included for reference only.) the TextBox control is data-bound to an instance of the Contact class. You need to ensure that the Contact class contains a business rule to ensure that the ContactName property is not empty or NULL. You also need to ensure that the TextBox control validates the input data. Which two actions should you perform?（）
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中国第一位大力写作五言诗的文人是（）
