题目折弯4mm厚的板材应该选用下模的开口尺寸为( )为宜。A. 24mmB. 28mmC. 32mmD. 36mm折弯4mm厚的板材应该选用下模的开口尺寸为( )为宜。A. 24mmB. 28mmC. 32mmD. 36mm题目解答答案C. 32mm