Circle your answer to a math or science problem.

数学或科学问题要让答案圆满。

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Math anxiety is a problem that has been researched in external educational psychology circle , but that is not the case in China .

数学焦虑是国外教育心理学领域关注了近半个世纪的研究课题，而中国数学教育心理学界对此问题的研究还比较少。

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The math model on out-moving jaw crusher mechanism of changing length link with high-joint is established by using closing-vector-circle method.

采用封闭矢量环法推导建立含有高副的变长连杆的外动颚式破碎机构的数学模型。

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