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【单选题】
某项目的固定资产原值为3000万元，无形资产和其他资产为2000万元，若净残值率10%，预计使用年限为10年。采用平均年限折旧法，则第一年应提取的折旧额为（）万元。
A.
180
B.
270
C.
300
D.
450
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