buna S丁苯橡胶
buna-丁腈橡胶;用来制柔性印版或胶辊的一种合成橡胶
buna sahipler他们有那东西
N(名词) a synthetic rubber formed by polymerizing butadiene or by copolymerizing it with such compounds as acrylonitrile or styrene 布纳牌橡胶 [trademark]