The National Transportation Safety Board has recommended the use of fail-safe mechanisms on airliner cargo door latches assuring the doors are properly closed before takeoff and to prevent them from popping open in flight.
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Aassuring the doors are properly closed
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Bfor the assurance of proper closing
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Cassuring proper closure
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Dto assure closing the doors properly
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Eto assure that the doors are properly closed
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显示答案
正确答案: E