下列普通钢筋的表示方式中,表示机械连接的钢筋接头的是()。
A <img src="https://www.beizhujiaoyu.com/uploads/202208/165597823259731.png" width="142" height="23" /> B <img src="https://www.beizhujiaoyu.com/uploads/202208/165597850484821.png" width="142" height="22" /> C <img src="https://www.beizhujiaoyu.com/uploads/202208/165597850975491.png" width="142" height="21" /> D <img src="https://www.beizhujiaoyu.com/uploads/202208/165597851488671.png" width="142" height="28" />