29. What is the time basis for customs clearance operations at the logistics center?
(A)a working-hour basis
(B)a 24-hour basis
(C)a working day basis
(D)a 12-hour basis
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統計: A(0), B(1), C(0), D(0), E(0) #3925093
統計: A(0), B(1), C(0), D(0), E(0) #3925093