结构所受荷载如图1-1-32所示。拉杆AB的拉力是多少？（）

• A.<img src="https://timg.fentiku.com/javaimportItems/7ccedf2d1910465fbfe69efadd4fae23/images/107099.png" /><br/>
• B.<img src="https://timg.fentiku.com/javaimportItems/7ccedf2d1910465fbfe69efadd4fae23/images/10780b.png" /><br/>
• C.<img src="https://timg.fentiku.com/javaimportItems/7ccedf2d1910465fbfe69efadd4fae23/images/107ef7.png" /><br/>
• D.<img src="https://timg.fentiku.com/javaimportItems/7ccedf2d1910465fbfe69efadd4fae23/images/108692.png" /><br/>

正确答案：A