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图示结构梁a点处的弯矩是：
- A.<img src="https://timg.fentiku.com/97/2016/12/22/tYBH3l54eE.png" title='tYBH3l54eE.png' alt='tYBH3l54eE.png'/>
- B.<img src="https://timg.fentiku.com/97/2016/12/22/a1F8f0W0DA.png" title='a1F8f0W0DA.png' alt='a1F8f0W0DA.png'/>
- C.<img src="https://timg.fentiku.com/97/2016/12/22/UYuRCB3Dz9.png" title='UYuRCB3Dz9.png' alt='UYuRCB3Dz9.png'/>
- D.<img src="https://timg.fentiku.com/97/2016/12/22/arw5xLVuwK.png" title='arw5xLVuwK.png' alt='arw5xLVuwK.png'/>
正确答案：A