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简述老头父爱悲剧的社会意义。

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度量借款人的“5C”分别指什么内容？

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当浙江的学生放暑假时，澳大利亚处在（）

A. 春季
B. 夏季
C. 秋季
D. 冬季

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You are developing a page named Products.aspx in a Web application that contains three DropDownList controls that are dynamically loaded from a SQL Server 2005 database file. The DropDownList controls represent a vendor list, a certification list, and an exam list. Certkiller .com customers use the Products.aspx page to select exams related to particular certifications on offer from a particular vendor. A Go button initiates the selection. Each DropDownList control has an associated RequiredFieldValidator control.Whenever the customer selects a vendor, and the vendor offers certifications, then the customer must also select a certification if the. If the vendor only offers exams and not certifications, the certification list should remain hidden. Whenever the customer selects a certification, the customer must also select an exam. Validation error messages should only be displayed when the Go button is clicked. You need to set properties on the vendor DropDownList control. What should you do?（）

A. Set the AutoPostBack property to True and the CausesValidation property to False.
B. Set the AutoPostBack property to False and the CausesValidation property to True.
C. Set the AutoPostBack property to True and the CausesValidation property to True.
D. Set the AutoPostBack property to False and the CausesValidation property to False.

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用方格网法计算土方量的主要步骤是：划分方格网-求平整标高-求各个角点的自然标高-求各个角点的设计标高--求施工标高-求零点线-计算土方量。

A. 正确
B. 错误

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