短語詞組短語overhead back downward pull 過頂后下拉back -pull wire-drawing 反拉力拉絲back pull drawing 后張力拉伸;后推力拉伸back pull force 反拉力back pull wire drawing 后拉力拔絲法back pull stress 逆應(yīng)力Back pull pattern 后拉式 返回 back pull