45.一般結構損傷可分為哪幾類：
(A) AERODYNAMIC SMOOTHNESS, ACCIDENTAL DAMAGE, FATIGUE DAMAGE
(B) ENVIRONMENTAL DAMAGE, CORROSION, FATIGUE DAMAGE
(C) ENVIRONMENTAL DAMAGE, ACCIDENTAL DAMAGE, FATIGUE DAMAGE
(D) ENVIRONMENTAL DAMAGE, ACCIDENTAL DAMAGE, ERROSION

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