69. What is the product structure of the following reaction? 
(A)
(B) 
(C)
(D) 
(E) none of them
答案:登入後查看
統計: A(0), B(2), C(1), D(0), E(0) #2055486
統計: A(0), B(2), C(1), D(0), E(0) #2055486