1. classification: performance optimization is a necessary task for application development. one of its purposes is to provide users with the ultimate speed experience. this article summarizes 6 it is the largest radio and television media organization in shandong province. it has 2 sets of tv satellite channels, shandong satellite tv, taishan international channel, 9 sets of tv ground channels, qilu channel, sports channel, agricultural science channel, public channel, film and television channel, variety channel, life channel, children's channel, home shopping channel, 4 sets of digital tv channels, collection world, qilu theater, happy childhood, reading channel, and 8 sets of radio channels, shandong people's radio, economic radio, female anchor radio, life broadcast... 30 and

metal 3