单项选择题
A.≯0.2Mpa B.≯0.3Mpa C.≯0.4Mpa D.≯0.5Mpa
A.≤0.01Mpa B.≤0.02Mpa C.≤0.03Mpa D.≤0.04Mpa
A.1.0 B.0.5 C.1.2 D.1.5