图示两种三铰拱结构的水平推力有哪种关系？

• A.H<img src="https://timg.fentiku.com/97/2016/12/22/F8IEpWlJEz.png" title='F8IEpWlJEz.png' alt='F8IEpWlJEz.png'/>=H<img src="https://timg.fentiku.com/97/2016/12/22/kX5AeQ8KiS.png" title='kX5AeQ8KiS.png' alt='kX5AeQ8KiS.png'/>
• B.不能确定
• C.H<img src="https://timg.fentiku.com/97/2016/12/22/OOePGMZ5lm.png" title='OOePGMZ5lm.png' alt='OOePGMZ5lm.png'/>>H<img src="https://timg.fentiku.com/97/2016/12/22/XuAVCdMMwP.png" title='XuAVCdMMwP.png' alt='XuAVCdMMwP.png'/>
• D.H<img src="https://timg.fentiku.com/97/2016/12/22/deG4Syi7aQ.png" title='deG4Syi7aQ.png' alt='deG4Syi7aQ.png'/><H<img src="https://timg.fentiku.com/97/2016/12/22/ctPSsEYHGy.png" title='ctPSsEYHGy.png' alt='ctPSsEYHGy.png'/>

正确答案：A