机译:FEASIBILITY OF THE?documentclass12pt{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} begin{document}$$(4delta_t,sigma_{22c})$$end{document} CRITERION TO PREDICT FRACTURE TOUGHNESS OF FERRITIC STEEL USING SPECIFIED SPECIMEN TYPES