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阳台、楼板、屋面的防护栏杆应由上、下两道横杆及栏杆柱组成,上杆离地高度为( ),下杆离地高度为( )。

A.1.0~1.2m,0.5~0.6m
B.1.5~1.8m,0.6~0.8m
C.1.2~1.5m,0.7~0.9m
D.1.0~1.5m,0.4~0.5m
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