A.8% B.9% C.10% D.12%
A.無(wú)積水 B.基礎(chǔ)牢固、通道無(wú)障礙、有防滑措施并設(shè)置護(hù)欄 C.寬度不應(yīng)小于0.5m D.危險(xiǎn)地段應(yīng)設(shè)置警示標(biāo)志或警戒線