题目内容
( ) Looking at _______ requires even more walking, becauseyou cannot know it until you have spent considerable time walking around and through it.
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钢琴重奏练习技巧要求有哪些？
Ailerons, elevators and rudder are the secondary flight control surfaces of an aircraft.
Trailing edge (TE) flaps and leading edge (LE) flaps and slats (LE devices) are parts of high lift devices receiving power from hydraulic system B.
Roll control is accomplished by a hydraulically powered rudder and electrically flight spoiler.
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