• 2022-10-29
    构造柱马牙槎应()马牙槎沿高度方向的尺寸不易超过(),凹凸尺寸宜为()
    A: 先进后退,300mm,50mm
    B: 先退后进,200mm,60mm
    C: 先退后进,300mm,60mm
    D: 先进后退,200mm,50mm