29.圖中哪個構造可讓溶解物質自由通過?
(A)○1
(B)○2
(C)○3
(D)○4
答案:登入後查看
統計: A(1), B(0), C(0), D(0), E(0) #1083622
統計: A(1), B(0), C(0), D(0), E(0) #1083622