“Aircraft” means any machine that can derive support in the _______ from the reactions of the air other than the reactions of the air against the earth's surface.
A.atmosphere
B.water
C.sea
D.lake
正确答案是A
“Aircraft” means any machine that can derive support in the _______ from the reactions of the air other than the reactions of the air against the earth's surface.
A.atmosphere
B.water
C.sea
D.lake
正确答案是A