A.加大單組容量,減少組數(shù) B.加大單組容量,加大組數(shù) C.減少單組容量,加大組數(shù) D.減少單組容量,減少組數(shù)
A.4 B.6 C.8 D.10
A.85% B.70% C.50% D.25%