A.18 B.19 C.20 D.21
A.人員危險(xiǎn)點(diǎn) B.火災(zāi)危險(xiǎn)點(diǎn) C.設(shè)備危險(xiǎn)點(diǎn) D.道德危險(xiǎn)點(diǎn)
A.華爾茲B.探戈C.狐步D.快步舞