常用的:F/A FROM ABOVE从上面F/B FROM BELOW从下面T/A TO ABOVE到上面T/B TO BELOW到下面H/L HIGH LEVEL高位M/L MIDDLE LEVEL中位L/L LOW LEVEL低位G/D UNDERGROUND地面H/LB HIGH LEVEL BELOW高位下面A.F.F.L ABOVE FINISHED FLOOR LEVEL楼层平面以上F
常用的:F/A FROM ABOVE从上面F/B FROM BELOW从下面湖南中小学教师T/A TO ABOVE到上面T/B TO BELOW到下面H/L HIGH LEVEL高位M/L MIDDLE LEVEL中位L/L LOW LEVEL低位G/D UNDERGROUND地面H/LB HIGH LEVEL BELOW高位下面A.F.F.L ABOVE FINISHED FLOOR LEVEL