柱下对称独立基础如图9-9所示，基础宽度为b，基础自重和其上的土重为G，为使基础底面不出现拉力，基础顶面所承受的柱底竖向力F和M必须满足以下何种关系？【2011-109】

• A.<img src="https://timg.fentiku.com/101/2016/10/21/eDL6irRx7b.png" title='eDL6irRx7b.png' alt='eDL6irRx7b.png'/>
• B.<img src="https://timg.fentiku.com/101/2016/10/21/TJA5He3fJZ.png" title='TJA5He3fJZ.png' alt='TJA5He3fJZ.png'/>
• C.<img src="https://timg.fentiku.com/101/2016/10/21/H38kfmJnEW.png" title='H38kfmJnEW.png' alt='H38kfmJnEW.png'/>
• D.<img src="https://timg.fentiku.com/101/2016/10/21/69abv2XJgo.png" title='69abv2XJgo.png' alt='69abv2XJgo.png'/>

正确答案：D