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问题 单项选择题

数据库系统必须控制事务的并发执行，保证数据库 (45) 。假设事务T1、T2分别对数据A和B进行的操作如下图所示，事务T1与T2间的并发调度为可串行化调度的是 (46) 。
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答案

参考答案：B

问答题

In October 2008 Ronger Properties Joint Stock Co successfully issued corporate bonds of RMB 12 million yuan for three years. By the end of 2010 the net assets of Ronger Properties Joint Stock Co were RMB 80 million yuan. During the past two years it has been able to repay the interests due for the corporate bonds.In order to expand its business, the board of directors of Ronger Properties Joint Stock Co adopted a resolution intending to issue another set of corporate bonds to the public investors.Required:Answer the following questions in accordance with the relevant provisions of the Securities Law of China, and give your reasons for your answer:

(a) State the maximum amount of corporate bonds Ronger Properties Joint Stock Co could issue for the proposed issuance. (5 marks)
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填空题

甘麦大枣汤主治（）。
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