钢材双面角焊缝的标注方法，正确的是下列哪一种？【2006-160】

• A.<img src="https://timg.fentiku.com/101/2016/10/21/4VXj9HXCCU.png" title='4VXj9HXCCU.png' alt='4VXj9HXCCU.png'/>
• B.<img src="https://timg.fentiku.com/101/2016/10/21/WROw9Q6sVt.png" title='WROw9Q6sVt.png' alt='WROw9Q6sVt.png'/>
• C.<img src="https://timg.fentiku.com/101/2016/10/21/rExtx9yScG.png" title='rExtx9yScG.png' alt='rExtx9yScG.png'/>
• D.<img src="https://timg.fentiku.com/101/2016/10/21/Y7Z9dATYJV.png" title='Y7Z9dATYJV.png' alt='Y7Z9dATYJV.png'/>

正确答案：C