This paper indicates the principle and method of laying aperture of bridge and introducer the practical experiment on river rectification.

简述桥孔设计的原则和方法，并谈了河道整治的体会。

youdao

It is ideal for those who have an understanding of ISO, aperture, shutter speed, white balance and how to change these on your digital SLR or bridge camera.

这门课同样适合那些懂得IS O感光度、光圈、快门速度、白平衡等摄影知识并能用自己的数码单反或桥梁相机设置这些参数的同学。

youdao