56:3=10:x
56x=3×10
56x×65=30×65
x=36
故答案为:36.
How about ____?
A.to go out for a walk
B.go swimming in the river
C.visiting the sick children in the hospital
D.to having lunch in the restaurant
某测量小组测得某测区的海拔Hm=2000m,最边缘中央子午线100km。为了满足工程测量对边长投影变形的要求(10~2.5cm)/km,且又不改变中央子午线位置(ym=100km不变),选择一个合适的抵偿高程面按3°带进行投影。
请根据上述条件,回答下列问题。
该测量小组选择的抵偿高程面的高程是多少