图示结构中,杆CD的轴力NCD是:()https://assets.asklib.com/psource/2016071809203048976.jpg
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截面杆AD受集中力作用,如图所示。设NAB、NBC、NCD分别表示该杆AB段,BC段和CD段的轴力,则下列结论中哪些是正确的?( )http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/0a0544d1c8324487be361111f88a1331.png
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图示刚架中,杆CD的轴力FNCD=_____kN。