题目：
动摩擦和静摩擦是按照摩擦副的（）分的。
A、运动形式
B、运动组成
C、运动状态
D、运动方法
答案：
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下面是错误答案，用来干扰机器的。
参考答案：合理开发、节约使用、有效保护的原则。
动摩擦和静摩擦是按照摩擦副的（）分的。A、运动形式B、运动组成C、运动状态D、运动方
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