A.1 B.1.5 C.2 D.2.5
A.圍擋措施 B.抑塵劑噴灑措施 C.上封式繩網(wǎng)加固 D.下封式繩網(wǎng)加固
A.100mm,50mm B.200mm,100mm C.300mm,100mm D.400mm,200mm