题目内容：
某企业有一台高精度磨床，价值为20000元，使用年限为10年，目前已使用2年。这时由于生产该种设备的劳动生产率提高，所需社会必要劳动时间减少，其价值降为15000元。此时，这台高精度磨床的物质磨损是
A、1000元B、2000元
C、3000元D、4000元
参考答案：
选择题：某企业有一台高精度磨床,价值为20000元,使用年限为10年,目前已使用2年。这时由于生产该种设备的
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