A.小于0.045% B.不大于0.035% C.不大于0.05% D.不大于0.03%
A.小于0.25% B.小于0.15% C.小于0.20% D.0.25-0.60%
A.不大于2% B.不大于5% C.不大于3% D.不大于4%