33. The methyl ester of a carboxylic acid can be synthesized by directly using .
(A) SOCl2
(B) PCl5
(C) CH2N2
(D) C2O2Cl2
(E) CH3NH2
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統計: A(0), B(0), C(19), D(4), E(1) #1072921
統計: A(0), B(0), C(19), D(4), E(1) #1072921