硝化纤维素塑料
nitrocellulose plastics
cellulose nitrate plastic
硝化纤维素
cellulose nitrate nitrocellulose
Nitrocellulose
cellulose nitrate
blood Pb level
微纤化纤维素
microfibrillated cellulose
碳化纤维增强体
carbide fibre reinforcement
碳化纤维强化体
carbide fibre reinforcement