A:directio
B:compositio
C:prescriptio
D:presentatio
下图为我国某城市1986年~2011年外来暂住人口变化情况。推测该城市近十年外来暂住人口比重的变化趋势及原因( )
________ the job takes a significant amount of time, most students agree that the experience is worth it.
如图,在直角三角形ABC中,∠C=90°,AB=10,AC=8,点E、F分别为AC和AB的中点,则EF=( ).