防护栏杆应由上、卜两道横杆及栏杆柱组成,上杆离地高度为()下杆离地高度为()
防护栏杆应由上、卜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.0.6~1.0m,0.3~0.5m
B.1.0~1.2m,0.5~0.8m
C.1.0~1.2m,0.5~0.6m
D.1.0~1.2m,0.6~0.8m
正确答案:C
防护栏杆应由上、卜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.0.6~1.0m,0.3~0.5m
B.1.0~1.2m,0.5~0.8m
C.1.0~1.2m,0.5~0.6m
D.1.0~1.2m,0.6~0.8m
正确答案:C
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