5. If f ′ is continuous on R = (−∞,∞) and
f(x) = 0 , then 
(A)O
(B)X
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統計: A(1), B(0), C(0), D(0), E(0) #2264869
統計: A(1), B(0), C(0), D(0), E(0) #2264869