depreciation expense to income ratio英 [dɪˌpriːʃɪˈeɪʃən ɪkˈspens tu ˈɪnkʌm ˈreɪʃiəʊ]美 [dɪˌpriʃiˈeɪʃən ɪkˈspens tu ˈɪnkʌm ˈreɪʃioʊ]折旧费对收益的比率经济