_______ warn of weather hazards which mainly concern light aircraft.
A.AIRMETs
B.SIGMETs
C.Convective SIGMETs
D.Both A and B
正确答案是A
_______ warn of weather hazards which mainly concern light aircraft.
A.AIRMETs
B.SIGMETs
C.Convective SIGMETs
D.Both A and B
正确答案是A