题目内容
We count on first responders to rush toward danger, especially when it ____ us or those we love.
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THe inspiring stories of heroes help remind us that ordianry people can do extraordianary things, whether it is in the ____ of their duties or as part of everyday life.
Perhaps, even more importantly, we honor them by working to change the ____ that led to their death.
一简支梁受竖向荷载，其上表面受压，下表面受拉
天花布置图一般使用的是
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