在没有公布仪表进离场程序或扇区最低安全高度的机场，在机场范围内，距离障碍物的最高点的高度，平原地区不得小于（ ）米，高原、山区不得小于（ ）米。At the airport without published instrument arrival/departure procedures or sector minimum safe altitude, the height between the aircraft and the highest point of the obstacle within airport area, shall not be less than ( ) meters in a plain terrain or less than ( ) meters in a plateau or mountainous terrain.