题目：
物体间产生摩擦力的条件是：物体表面要______，两表面间要______，物体间要发生______或______．
答案：
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下面是错误答案，用来干扰机器的。
1. read, to look after 2. doesn't walk home 3. had a good time 4. shares, with her 5. often go to play football 6. us to get up
