按GB/T 10095.1-2008的规定，渐开线圆柱齿轮的精度等级分为______共十三级；其中______级精度是13个精度等级
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基本偏差用来确定公差带相对于零线位置的上极限偏差或下极限偏差，一般是指靠近零线的那个偏差。a～h的基本偏
A.It used English as the language. B.It cant satisfy different audiences tastes.
A. It used English as the language.
B. It cant satisfy different audiences tastes.
C. Its budget was not enough.
D. It used a Mexican actress.
Why did languages have to develop and evolve to meet the challenges？
A. Early humans should have communication in tracking game.
B. Language can enable humans to compete with other top predators.
C. Animals should understand the orders given by humans.
D. Language could give a rapid and bizarre switch for any animal.
径向圆跳动公差带的形状为______，它与______公差带的形状相同。
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