TETRACHLOROETHYLENE, HPLC/SPECTRO GRADETETRACHLOROETHYLENE, ACS GRADEPerchloroethylenePercPerchloroetheneTetrachloroethylenePCETetrachloroethylene四氯乙烯全氯乙烯Density 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