评论
打印
1.Before landing his helicopter after its first successful flight, Cornu had to
a) descend for twenty seconds
b) descend one foot
c) descend directly over four bicycles
2.Cornu made what became his record flight after he had
a) built a better helicopter
b) improved his flying technique
c) increased the altitude by 5 feet
3.An aircraft's landing gear is
a) the place on which an aircraft lands
b) the parts of the aircraft on which it lands
c) the data a pilot uses when landing an aircraft
