21. Calculate the Rf values for C on the following TLC plate:
(A) 0.35
(B) 0.60
(C) 0.67
(D) 0.8
(E) 0.87
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統計: A(0), B(1), C(0), D(0), E(0) #3770859
統計: A(0), B(1), C(0), D(0), E(0) #3770859