73.PS(Poly Styrene)是 
(A)聚乙烯(PE) 
(B)聚丙烯(PP) 
(C)聚丁烯(PB) 
(D)聚苯乙烯(PS)

答案:登入後查看
統計: A(0), B(0), C(0), D(7), E(0) #2899792