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
統計: A(0), B(0), C(0), D(7), E(0) #2899792