题目内容

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.

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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

A. 对
B. 错

‌天花布置图一般使用的是‍

A. 镜像视图
B. 主视图
C. 透视图
D. 立面图

有两个力对同一根梁作用产生弯矩，可以直接将两个力产生的弯矩数值相加即可得到该梁的最终弯矩。

A. 对
B. 错