7. 量測自由餘氯時所使用之藥劑為以下何者?
(A)N,N-diethyl-p-phenylenediamine
(B)Sudan Orange G
(C)Diethyl yellow
(D)Dichlorobromomethane

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統計： A(11), B(0), C(1), D(0), E(0) #2947857