摘要：2．写字时铅笔笔尖与纸面间的摩擦是摩擦.转笔刀转孔与铅笔间的摩擦是摩擦．

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22、写字时铅笔笔尖与纸面间的摩擦是

摩擦，转笔刀转孔与铅笔间的摩擦是

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写字时铅笔笔尖与纸面间的摩擦是______摩擦，转笔刀转孔与铅笔间的摩擦是______摩擦．

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写字时铅笔笔尖与纸面间的摩擦是摩擦，转笔刀转孔与铅笔间的摩擦是摩擦．查看习题详情和答案>>

写字时铅笔笔尖与纸面间的摩擦是摩擦，转笔刀转孔与铅笔间的摩擦是摩擦．查看习题详情和答案>>

写字时铅笔笔尖与纸面间的摩擦是摩擦，转笔刀转孔与铅笔间的摩擦是摩擦．

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