题目：品种法成本计算期的特点是（ ） The characteristics of variety costing period are ( )
A. 不定期计算成本，与生产周期一致 The cost is calculated from time to time, consistent with the production cycle
B. 不定期计算成本，与会计报告期不一致 The cost is not calculated regularly, which is inconsistent with the accounting reporting period
C. 定期按月计算成本，与生产周期一致 The cost is calculated regularly on a monthly basis, consistent with the production cycle
D. 定期按月计算成本，与会计报告期一致 Cost is calculated regularly on a monthly basis, consistent with the accounting reporting period
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