题目内容

简述“四・一二”反革命政变。

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决策支持系统的基本结构是人机交互系统、模型库系统和数据库系统三个子系统的有机结合。

A. 正确
B. 错误

列车司机在列车运行中,遇有信号显示不明或危及行车和人身安全时,应立即采取()措施。

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If you have to jump in the water when abandoning a vessel,your legs should be().

A. spread apart as far as possible
B. held as tightly against your chest as possible
C. in a kneeling position
D. extended straight down and crossed at the ankle

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