[数] 任意函数法 arbitrary depreciation method: 任意折旧法arbitrary proportion method: 指定配合法arbitrary proportions method: 经验配比法; 经验配合法; 习用配料法depreciation arbitrary method: 任意折旧法depreciation-arbitrary method: 任意折旧法; 折旧-任意决定法下载手机词典可随时随地查词查翻译