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病案分析题（请分析下列病案的证型，辨证分析；并写出治法、主方和用药）患者，男性，57岁，干部。反复发作胸痛，心悸半年，近月来，心悸发作频繁，不能安睡，胸痛虽然持续时间不长，但痛势较剧，痛甚时冷汗出，不能动，并有舌尖发麻、胸部紧闷、头晕眼花等感觉。经某医院作胆固醇、心电图等检查，诊断为冠心病，服双嘧达莫（潘生丁）、硝酸甘油片等药，虽能暂时缓解症状，但仍反复发作。诊见面色紫暗，舌质稍淡，边有瘀斑，苔薄白，脉细涩。

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《汤姆・琼斯》的艺术特色？

You want to track and store all transactional changes to a table over its lifetime. To accomplish this task， you enabled Flashback Data Archive with the retention of 5 years. After some time， the business requirement changed and you were asked to change the retention from 5 years to 3 years. To accomplish this， you issued the following command： ALTER FLASHBACK ARCHIVE fla1 MODIFY RETENTION 3 YEAR； What is the implication of this command？（）

A. The command produces an error because the retention time cannot be reduced.
B. All historical data is retained but the subsequent flashback data archives are maintained for only three years.
C. All historical data is purged and the new flashback data archives are maintained for three years.
D. All historical data older than three years is purged from the flashback archive FLA1.

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植物线虫病害的症状特点为（）。

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当机舱发生火灾需用大型CO2施救时，轮机长应做的工作是（）。 Ⅰ、检查火源，并检查CO2系统是否状态良好，立即施放CO2灭火； Ⅱ、指挥关停各运转设备，封闭机舱门窗，通风口，放掉存压设备的压力； Ⅲ、通知并确信全部人员已经离开机舱后，通知船长施放CO2灭火。

A. Ⅰ+Ⅱ
B. Ⅰ+Ⅲ
C. Ⅱ+Ⅲ
D. Ⅰ+Ⅱ+Ⅲ

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