阿摩線上測驗
9. Wind energy includes de-icing and self-cleaning technologies that reduce __________ to power generation.
(A) assistances
(B) permissions
(C) advantages
(D) impediments
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統計： A(0), B(1), C(0), D(0), E(0) #3368717
統計： A(0), B(1), C(0), D(0), E(0) #3368717
