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名词解释题

焦点的调制传递函数

发布日期:2021-11-04

焦点的调制传递函数

试题解析

高压切焦水泵

高压切焦水泵是一种利用高压的切焦水泵。

中文名
高压切焦水泵
介质温度
50~60℃
输送介质
含焦粉污水。
流量Q
155~300m3/h

后焦距

后焦距(BFD)又称后焦长(BFL)是系统最后一个光学表面顶点至后方焦点的距离。在空气中的光学系统,有效焦距是由前面和后面的主平面至对应的焦点的距离。如果周围的环境不是空气,则距离要乘上该物质的折射系数。有些作者称这个距离为前(后)焦距,与上面定义的前(后)焦点距离有所区别。

中文名
后焦距
别名
法兰焦距
英文缩写
BFL
外文名
Back focal length
领域
光学
相关名词
前焦距

七焦

七焦 ,人体部位名。指第七、八胸椎棘突间。《灵枢·背腧》:“膈腧在七焦之间。”

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大学试题

医学

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