单面焊接的钢筋接头，下列何种标注方式是正确的？【2003-160】

• A.<img src="https://timg.fentiku.com/101/2016/10/21/HSNBO9RSEg.png" title='HSNBO9RSEg.png' alt='HSNBO9RSEg.png'/>
• B.<img src="https://timg.fentiku.com/101/2016/10/21/Awhf7mWEwP.png" title='Awhf7mWEwP.png' alt='Awhf7mWEwP.png'/>
• C.<img src="https://timg.fentiku.com/101/2016/10/21/wEgIrlSO9e.png" title='wEgIrlSO9e.png' alt='wEgIrlSO9e.png'/>
• D.<img src="https://timg.fentiku.com/101/2016/10/21/kqN3cgUYfp.png" title='kqN3cgUYfp.png' alt='kqN3cgUYfp.png'/>

正确答案：B