单项选择题
A.4.51% B.8.19% C.11.52% D.19.38%
A.2.147×10-6Pa·s B.5.168×10-6Pa·s C.7.294×10-6Pa·s D.8.434×10-6Pa·s
A.7.74%~35.31% B.13.5%~88% C.40%~73.5% D.19%~71%