图示桁架已知P，a，则1，2，3，4杆受力为( )。 -焚题库

来源：焚题库 2025-10-04

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图示桁架已知P，a，则1，2，3，4杆受力为( )。

A.S<img src="https://timg.fentiku.com/97/2016/12/22/v971Xj10JE.png" title='v971Xj10JE.png' alt='v971Xj10JE.png'/>=-9P,S<img src="https://timg.fentiku.com/97/2016/12/22/M9xG8HOHus.png" title='M9xG8HOHus.png' alt='M9xG8HOHus.png'/>=0,S<img src="https://timg.fentiku.com/97/2016/12/22/DzW42A233Y.png" title='DzW42A233Y.png' alt='DzW42A233Y.png'/>=1.414P,S<img src="https://timg.fentiku.com/97/2016/12/22/nN6e1UvlRQ.png" title='nN6e1UvlRQ.png' alt='nN6e1UvlRQ.png'/>=8P
B.S<img src="https://timg.fentiku.com/97/2016/12/22/DGV471Aib3.png" title='DGV471Aib3.png' alt='DGV471Aib3.png'/>=9P,S<img src="https://timg.fentiku.com/97/2016/12/22/JZO2p9avTH.png" title='JZO2p9avTH.png' alt='JZO2p9avTH.png'/>=0,S<img src="https://timg.fentiku.com/97/2016/12/22/k51X1IYrYD.png" title='k51X1IYrYD.png' alt='k51X1IYrYD.png'/>=-1.414P,S<img src="https://timg.fentiku.com/97/2016/12/22/UQZK7J7Iqk.png" title='UQZK7J7Iqk.png' alt='UQZK7J7Iqk.png'/>=-8P
C.S<img src="https://timg.fentiku.com/97/2016/12/22/euGc1PIZr0.png" title='euGc1PIZr0.png' alt='euGc1PIZr0.png'/>=-4.5P,S<img src="https://timg.fentiku.com/97/2016/12/22/gf2YH4i4HN.png" title='gf2YH4i4HN.png' alt='gf2YH4i4HN.png'/>=0,S<img src="https://timg.fentiku.com/97/2016/12/22/AhxOvTx196.png" title='AhxOvTx196.png' alt='AhxOvTx196.png'/>=0.707P,S<img src="https://timg.fentiku.com/97/2016/12/22/BYR2Q6FouE.png" title='BYR2Q6FouE.png' alt='BYR2Q6FouE.png'/>=4P
D.S<img src="https://timg.fentiku.com/97/2016/12/22/ePSjgckYOd.png" title='ePSjgckYOd.png' alt='ePSjgckYOd.png'/>=4.5P,S<img src="https://timg.fentiku.com/97/2016/12/22/EOWVqHOskw.png" title='EOWVqHOskw.png' alt='EOWVqHOskw.png'/>=0,S<img src="https://timg.fentiku.com/97/2016/12/22/ajrsAFP8ae.png" title='ajrsAFP8ae.png' alt='ajrsAFP8ae.png'/>=-0.707P,S<img src="https://timg.fentiku.com/97/2016/12/22/UwqYegOKp9.png" title='UwqYegOKp9.png' alt='UwqYegOKp9.png'/>=-4P

正确答案：C

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