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单选题
如果在无线电高度小于 ( ) AGL 并且指示空速小于 ( )KIAS时，任何一个起落架没有放下并锁定，那么系统将发出＇TOO LOW GEAR＇的语音警告。The ＇TOO LOW GEAR＇ aural warning sounds if any landing gear is not down and locked with the radio altitude less than ( ) ft AGL and the indicated airspeed at less than ( ) KIAS.
A
500；200
B
500；190
C
1000；200
D
1500; 190
答案解析
正确答案：B
