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【单选题】
某机器设备原始价值14万元，预计净残值率5%，预计使用年限6年，用年数总和法折旧，第2年应提的折旧额为( )万元。A.
2.532
B.
3.165
C.
3.33
D.
2.664
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【单选题】线虫和地下害虫多会加重病害,原因主要是:
A.
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B.
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C.
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D.
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