Lesson 4 900 句填空-1 Monitor Tower on __________
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Lesson 4 900 句填空-2 Sorry for ———— the frequency due ———— jammed
Lesson 4 900 句填空-3 ________, we made the wrong ______
Lesson 4 900 句填空-4 SELCAL CODE _______ , request _______
Lesson 4 900 句填空-5 CPDLC ________, request to revert to(恢复） ________
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