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《汤姆・琼斯》的艺术特色？

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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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患者男，56岁，公务员，因“畏寒、高热、剧烈头痛、肌肉酸痛、乏力、头昏1d”来诊。自服头孢氨苄无效。发病前3d出差。查体：T39.5℃，P122次/min，BP142/96mmHg；口角疱疹，咽部充血；双肺呼吸音粗；肝、肾区无扣痛。对于与患者同行的密切接触者，下列处理正确的有（）

A. 隔离观察7d
B. 口服奥司他韦1周预防
C. 口服扎那米韦1周预防
D. 口服金刚烷胺1周预防
E. 接种疫苗
F. 注射高效价丙种球蛋白
G. 加强体育锻炼

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