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【简答题】
一轮系如图所示。已知电机转速n 1 =1000r/min，z 4 =4z 1 ，z 6 =2z 5 ，z 7 =z 8 ，z 9 =1，z 10 =100，齿条z 11 =20，m=4mm。求齿条的速度及方向。
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encourage institutions to do interdisciplinary researches
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state many institutions strive to study set environment's influence on humans
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prove that researches in neuroscience have been in popularity
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Worse than in the past.
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literature
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human education
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math education
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the universities
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the 4-year undergraduate institution
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the the 2-year community college
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