相关试题
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We have trouble in extending landing gear, we‘d like to _______ .
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It’s very kind _______ you to help us when we are in such a trouble.
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airplane has fixed landing gear, it is considered to be in a clean configuration when the _______ .
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To keep health, we have to keep _______ hours.
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We’re returning due to burst tyre during _______ retraction, we were lucky it didn’t burst in the w