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Helicopter Pilot Ground School Course, 2001 Revised Edition ;
直升机飞行员地面学校课程， 2001年修订版 ；
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The text of the present edition has been revised, and some additions have been made.
本版的正文已作了修改，并有若干补充。
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The text of the present edition has been revised, and some additions have been made.
本版的正文已作了修改，并有若干补充。
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