Helicopters can operate at a height between 1 and 10 meters with

  • 2023-12-26 22:33:30
  • 英语
  • 1

Helicopters can operate at a height between 1 and 10 meters with 10 meters distance from obstacles, but its flying speed should not exceed _______ km/h.

A.10

B.15

C.20

D.30

正确答案是B