angle operation materials primary school mathematics experiment equipment teaching aids science and education instruments angle measuring tool

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angle operation materials primary school mathematics experiment equipment teaching aids science and education instruments angle measuring tool 中文版

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Item No. 青华20531

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Qinghua science instruments 14yr.

Main Products:

Human model human organ model animal plant specimen model human skeleton teaching equipment biological model

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zhengChat

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86-13750965003

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2403396147@qq.com

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13750965003

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Ningbo Qinghua Science and Education Instrument Co.， Ltd.， No. 9， Zhushan North Road， Taoyuan Street， Ninghai county， Ningbo city， Zhejiang province,Yiwu City,Jinhua City City,Zhejiang Province

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测定水平角或竖直角的工作。水平角是一点到两个目标的方向线垂直投影在水平面上所成的夹角。竖直角是一点到目标的方向线和一特定方向之间在同一竖直面内的夹角。通常以水平方向或天顶方向作为特定方向。水平方向和目标间的夹角称为高度角。天顶方向和目标方向间的夹角称为天顶距。角度的度量常用60分制和弧度制。60分制即一周为360°、1°为60′、1′为60″。弧度制采用圆周角的2π分之一为1弧度。1弧度约等于57°17′45″。此外，军事上常用密位作量角的单位。为使1密位所对的弧长约略等于半径的1/1000，取圆周角的1/6000为1密位。角度测量主要使用经纬仪。测角时安置经纬仪，使仪器中心与测站标志中心在同一铅垂线上，利用照准部上的水准器整平仪器后，进行水平角或竖直角观测。 undefined

Update time：20241005140525