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deprecation allowance 可免税的折旧
depreciation allowances 折旧费
special depreciation allowance 特殊折旧补偿
annual depreciation allowance 每年折旧免税额
depreciation allowance claimed 索赔折旧免税额；折旧免税额索赔；折旧免税额
accelerated depreciation allowance 加速折旧扣除
improved depreciation allowance 加快折旧扣除
Initial Depreciation Allowance-IDA 初始折旧