A.2萬(wàn) B.1.6萬(wàn) C.1萬(wàn) D.0.6萬(wàn)
A.25天/50天 B.25天/56天 C.21天/56天 D.21天/50天
A.30%/50% B.30%/30% C.50%/50% D.50%/30%