13. 請問化學肥料的主要要素為何?
(A)N,P,K
(B)K,P,Fe
(C)N,Fe,K
(D)N,Fe,P
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統計: A(1), B(0), C(0), D(0), E(0) #3959431
統計: A(1), B(0), C(0), D(0), E(0) #3959431