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单项选择题
A.0.5m
B.1m
C.1.5m
D.2m
单项选择题
A.45°±5°,20cm
B.60°±5°,30cm
C.75°±5°,30cm
D.55°±5°,20cm
单项选择题
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
单项选择题
A.h=2~5m时,坠落半径R为2m
B.h=5~15m时,坠落半径R为3m
C.h=15~30m时,坠落半径R为3m
D.h>30m时,坠落半径R为5m以上