31. In the following scenarios, what is a possible scenario for food contamination?
(A) food preparation on a cutting board
(B) washing vegetables
(C) cured meat slices from automated meat cutter
(D) all of the above
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統計: A(0), B(0), C(1), D(0), E(0) #3356827
統計: A(0), B(0), C(1), D(0), E(0) #3356827