单项选择题
A.30-50g/L B.50-100g/L C.100-150g/L D.50-150g/L
A.13.0 B.13.5 C.14.0 D.14.5
A.≤1.0Mpa B.≤1.1Mpa C.≤1.2Mpa D.≤1.3Mpa