A.每1km抽檢2處,每處測2點(diǎn) B.每2km抽檢2處,每處測2點(diǎn) C.每5km抽檢5處,每處測2點(diǎn) D.每10km抽檢5處,每處測2點(diǎn)
A.5,5 B.5,25 C.10,25 D.10,20
A.5 B.9 C.12 D.16