Maintenance指的是（)？

A.测量，包括六西格玛、传感器监测

B.方法，包括工艺、效率、和产能

C.维护，包括使用率、故障率、和运维成本

D.材料，包括特性和功能

请帮忙给出正确答案和分析，谢谢！

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