词汇与结构There must be bigger gaps between aircraft on ____ approach to both protect the ILS signal and to cope with slower runway vacation times.
A. initial
B. final
C. medium
D. precision
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词汇与结构In addition, the airport itself has special considerations for low ____ operations.
A. visual range
B. visibility
C. view
D. vision
词汇与结构The airport itself has special considerations for low visibility operations including different lighting for approach, runways, and taxiways as well as the location of ____ equipment.
A. abnormal
B. normal
C. emergency
D. urgency
词汇与结构A pilot of an aircraft in instrument ____ conditions, by the means of radio, GPS or INS navigation with no assistance from air traffic control, can navigate to the airport.
A. meteorological
B. environmental
C. climatic
D. atmospheric
蛤蚧属于
A. 鱼纲
B. 两栖纲
C. 爬行纲
D. 哺乳纲