桥梁高空作业中必须时刻注意周边环境，防止碰触架空电线，恶劣天气严禁（）作业。
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突发事件：学生拿着刀进寝室向其他同学借钱，怎么办？
A vessel crossing a river on the Western Rivers has the right of way over（）.
A. vessels ascending the river
B. vessels descending the river
C. all vessels ascending and descending the river
D. None of the above
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