![](https://static.youtibao.com/asksite/comm/h5/images/m_q_title.png)
[单选题]
根据《水利水电工程土建施工安全技术规范》(SL 399-2007)规定,人工砂石料开采,以离料场开采边线( )界,范围内为危险区,该区域严禁布置办公、生活、炸药库等设施。
A.100m
B.300m
C.400m
D.500m
查看答案
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)
A.100m
B.300m
C.400m
D.500m
A.5%
B.10%
C.15%
D.20%
A.20°~30°
B.25°~35°
C.30°~40°
D.35°~45°
A.0.5m
B.0.8m
C.1.2m
D.1.5m
A.0.5h
B.1h
C.1.5h
D.2h