单项选择题
A.60% B.64% C.76% D.85%
A.1.5×10-4m3气/m3液 B.1.7×10-4m3气/m3液 C.2×10-4m3气/m3液 D.2.5×10-4m3气/m3液
A.4.1% B.7.5% C.16.3% D.23.9%