相关题目
You are loud and clear means that I read you （ ） .
I can hear you but with difficulty refers to readability （ ） .
Aircraft undertaking agricultural missions in hilly or mountainous areas should keep a distance of （ ） m from the crops
To approach on the same runway, the preceding heavy aircraft should maintain at least a （ ）-minute non-radar wake separation from the light aircraft behind.
General aviation airport operation instructions are certified by （ ） ; en-route and line airport operation instructions are certified by （ ） and put on the records of CAAC, and international airport operation instructions are certified by （ ） .
The maximum width of an air route within the territory of the People’s Republic of China is （ ） km and the minimum width is 8KM.
A foreign civil aircraft making flight within the territory of the People＇s Republic of China shall follow a （ ） air route, deviation from which is prohibited.
In aerial photography flight, the safety altitude between the aircraft and obstacles in mountainous areas should not be less than （ ） m.
The flight altitude or flight level for each aircraft is （ ） by the relevant ATC unit.
Over mountainous region and plateau area the safe altitude along air route is （ ） m，above the highest elevation within 25KM on each side of the centre line of the air route.
