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问题 单项选择题

S-Designer是一种可视化的数据库设计工具，它的后续版本是Power-Designer，使用它可以完成如下的哪些功能 ( )。
Ⅰ．可以画数据流图(DFD)
Ⅱ．可以画实体-联系图(E-R图)，即设计概念数据模型(CDM)
Ⅲ．可以从概念数据模型(CDM)生成物理数据模型(PDM)
Ⅳ．可以从现存数据逆向生成物理数据模型(PDM)
Ⅴ．可以从物理数据模型(PDM)逆向生成概念数据模型(CDM)

A．Ⅰ，Ⅱ和Ⅲ

B．Ⅰ，Ⅱ和Ⅳ

C．Ⅰ，Ⅱ和Ⅴ

D．都可以

答案

参考答案：D

解析： Power-Designer是由Power Soft公司的产品，属于CASE工具。它包括Process Analyst模块，能产生数据字典、绘制数据流图；DataArchitect模块，可用于概念数据模型设计、物理数据模型的自动生成，数据库构造等：AppModeler模块，可用于物理数据库的设计和应用对象及数据组件的生成：MetaWorks模块，可通过模型的共享支持高级的团队工作的能力： WarehouseArchitect模块，用于数据仓库和数据集市的建模和实现： Viewer用于模型信息的只读访问。

解答题

口算．

340×6=

530×9=

5×270=

650×3=

7×120=

3×250=

850×2=

740×6=

8×380=

560×5=
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问答题

Buyer and Seller entered into a sales contract to buy 10,000 kg chemical products at a price of RMB 200 yuan/kg, totalling RMB 2 million yuan. Among other things, the sales contract stipulated the following terms and conditions: within 10 days after the conclusion of the contract Buyer would make the advance payment of RMB 500,000 yuan and Seller was to deliver all the goods to the place of Buyer; the remaining price of RMB 1·5 million yuan should be paid within five days upon the delivery of goods; any breach of contract should be subject to the liquidated damages equivalent to 20% of the total price.Buyer made the advance payment, but Seller did not deliver any goods. Buyer urged Seller to deliver the goods immediately, as its production would be seriously affected by the short supply of the goods. However, Seller declared force majeure as the reason for non-delivery. Seller insisted that it was only a trading company, not a producer of the chemical products. Seller alleged that upon the conclusion of the contract, it entered into a purchase agreement with a producer to buy the goods from the latter. Due to a fire accident, the producer could not supply the goods under the purchase agreement; Seller therefore could not deliver the goods to Buyer. Non-delivery of goods was due to force majeure that caused the failure to supply the goods by the producer to Seller.Buyer refused to accept Seller’s argument and bought 10,000 kg of the same products for replacement at a price of RMB 220 yuan/kg, resulting in a total extra cost of RMB 200,000 yuan. Meanwhile it filed a lawsuit against Seller in the court, requesting liquidated damages of RMB 400,000 yuan (20% of the total price) and the damages of RMB 200,000 yuan for extra price caused for the urgent purchase.Required:Answer the following questions in accordance with the relevant provisions of the Contract Law, and give your reasons for your answer:

(a) state whether Seller’s argument of force majeure can be established; (5 marks)
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