单项选择题
A.1/3~1/10B.1/2~1/10C.1/5~1/10D.1/4~1/10
A.0.1mmHgB.0.2mmHgC.1mmHgD.10mmHg
A.±0.1mgB.±0.2mgC.±0.3mgD.±0.4mg