53. This passage points out that the new communications equipment will be used by the president___________
(A) during national emergencies.
(B) during takeoffs and landings.
(C) during flight training.
(D) during equipment failure.
詳解 (共 2 筆)
未解鎖
A 有國家危機使用B 起降落時使用C 在...
未解鎖
In the event of a c...
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