直线流动

straight-line

least square straight-line fit

method of lines【数】;straight-line method【数】

exact straight-line mechanism【机】

straight-line amortization【会计】

straight-line method of amortization

fitting of a straight line【数】;straight-line fit【数】;straight-line fitting【数】

depreciation-straight line method【会计】;straight-line depreciation method【会计】