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幢是指一座独立的，包括不同结构和不同层次的房屋。( )

A. 对
B. 错

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______设计的主要对象是屏幕和模板。

动态投资回收期指标一般适用于评价开发完成后出租或经营的房地产开发项目。 ( )

A. 对
B. 错

Busy Company is a retailer. Most of its sales are made on credit terms. The following information relates to the first 4 years. Year 1 Year 2 Year 3 Year 4 ＄＄＄＄ Trade Debtor as at 31 December 500,000 400,000 550,000 600,000 Bad debt written off for the year ended 31 December - 30,000 10,000 29,000 Busy Company decides to set aside a provision for bad debts equivalent to 5% of trade debtors as at year end. Required: (a)Show how the provision for bad debts would be disclosed in the balance sheet as at 31 January Year 1 to Year 4. (b)Calculate the bad debt expenses for the respective profit and loss account for each of the 4 years.

在“学生选课”数据库中的两个关系如下： S(SNO，SNAME，SEX，AGE)，SC(SNO，CNO，GRADE) 则与SQL命令SELECT sname FROM s WHERE sno IN (SELECT sno FROM sc WHERE grade＜60)等价的关系代数表达式是______。