What are the main functions of the lens?

The lens has two fingers in the film and television. One refers to the optical component used by the movie camera and the projector to generate the image. The continuous picture taken from the start to the shutdown, or the segment between the two splice points, also called a Lens. So what is .......

Titanium dioxide prices are expected to continue to rise

On March 7th, Longli Li, Zhonghe Titanium Dioxide, Chengdu Vanadium Titanium and Daon Titanium jointly issued price adjustment letters, all of which sold the price of various types of titanium dioxide (including sulfuric acid titanium dioxide and chlorinated titanium dioxide). Based on the orig.......