单项选择题

A.无上限值Qj≥0.051Rbh0,有下限值Qj≤0.038RLbh0
B.有上限值Qj≤0.051Rbh0,无下限值Qj≥0.038RLbh0
C.有上限值Qj≤0.051Rbh0,有下限值Qj≥0.038RLbh0
D.无上限值Qj≥0.051Rbh0,无下限值Qj≥0.038RLbh0