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平面桁架中的AF、BE、CG三杆的答案

平面桁架中的AF、BE、CG三杆铅直,DE、FG两杆水平,在节点D作用一铅垂向下的力P(如图所示),其中BE杆内力Sbe为:()

单选题
2021-12-25 12:46
A、['Sbe=P
B、Sbe=-P(压力)
C、Sbe=
D、Sbe=-
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正确答案
A

试题解析

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