阿摩線上測驗
15. In the checking and maintenance schedules, the condition checking procedures are generally marked under the heading normal hours of service with a ________.
(A) C
(B) O
(C) R
(D) P
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統計： A(16), B(4), C(8), D(1), E(0) #3352421
統計： A(16), B(4), C(8), D(1), E(0) #3352421
