TETRACHLOROETHYLENE, HPLC/SPECTRO GRADETETRACHLOROETHYLENE, ACS GRADEPerchloroethyleneTetrachloroethylenePerchloroethenePercPCE全氯乙烯四氯乙烯TetrachloroethyleneDensity Standard 1623 kg/m3四氯乙烯密度标准品 1623kg/m3TetrachloroethylenePerkloneTetrachloroethylene, Ultrapure, Spectrophotometric Grade四氯乙烯, 超纯, 光谱级