A.定數(shù)量、品種 B.定點放置 C.定期更換 D.定期檢查維修 E.定人保管
A.20%~30% B.30%~40% C.40%~50% D.50%~60% E.60%~70%
A.14~16℃ B.16~18℃ C.18~22℃ D.24~26℃ E.26~28℃