单词:butadiene-vinylpyridine latex
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Transcript OK. Well I wanna talk about vinyl. Hmmwhy play it cause I dont have a record player. But well Im sat here which you cant see, but Im sat there you go, when I hear it, it will be worth it. here holding a new record. Everyone just laughed at
Guayule- A Promising Crop From The Desert D:Holy guayule,Yale. Y:Holy what? D:Guayule.It's a desert-dwelling shrub from the Southwest. Y:What about guayule?I never even heard of it. D:Several things.One of the most important features of the guayule p
Egyptian archaeologists have discovered the bottom part of an unknown pyramid in the Sakkara area about 18 miles south of Cairo. NationalGeographic explorer-in-residence Dr. Zahi Hawass, the Secretary General of the Egyptian Supreme Council for Anti
Vinyl Making a Record Comeback A technology thought to be obsolete only 10 years ago is making a surprising comeback. Like the fountain pen and the film camera, the vinyl phonograph record was thought to be a thing of the past. But not so, says Steve
AGRICULTURE REPORT – June 18, 2002: Sunflower Rubber By George Grow This is the VOA Special English AGRICULTURE REPORT. Many farmers grow sunflower plants. The tall plants produce beautiful flowers
Vinyl Records Making Comeback Vinyl records were the main format for commercial music distribution in the 20th century. But the big black disks, called LPs, nearly disappeared after audio cassettes and then digital media, like CDs and MP3s, took thei