对称的钢筋混凝土构件，在构建详图中应采用下列哪一种符号表示一半是模板图，一半是配筋图?

• A.<img src="https://timg.fentiku.com/101/2016/10/21/WgVUZx0g6a.png" title='WgVUZx0g6a.png' alt='WgVUZx0g6a.png'/>
• B.<img src="https://timg.fentiku.com/101/2016/10/21/xBqT71fBad.png" title='xBqT71fBad.png' alt='xBqT71fBad.png'/>
• C.<img src="https://timg.fentiku.com/101/2016/10/21/j8yS7e92TT.png" title='j8yS7e92TT.png' alt='j8yS7e92TT.png'/>
• D.<img src="https://timg.fentiku.com/101/2016/10/21/yixnG6aXqt.png" title='yixnG6aXqt.png' alt='yixnG6aXqt.png'/>

正确答案：A