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四名大学生为救一名落水女学生而牺牲，有人说他们的精神值得表扬，有人说四个换一个不值得，你怎么看？

He is a defiant protector of his ideas. Any rivaling thought would become his target. With

网络软件是实现网络功能所不可缺少的软环境。网络软件通常包括：网络协议和协议软件、【】。

Two trains running on parallel tracks are 600 miles apart. One train is moving east at a speed of 90 mph, while the other is moving west at 75 mph. How long will it take for the two trains to pass each other？