R50 Very toxic to aquatic organisms.
对水生生物有极高毒性；
Chemical composition shall fully be ISRI compliant for all R50-R65 used long rails.
所有的R 50 - R 65废旧长钢轨的化学成分都应完全符合ISRI标准的规定。
The text the coating technics of powder point to R50 fusible interlining is discussed, and some technical parameters in each process are introduced.
本文对R 5 0热熔衬布粉点涂层法进行了探讨，制定了相应的工艺参数。
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