单项选择题
A.20mmHg以下 B.25mmHg以下 C.30mmHg以下 D.35mmHg以下
A.5mm B.5.5mm C.6mm D.6.5mm
A.0.15~0.45mm B.0.25~0.5mm C.0.35~0.6mm D.O.45~0.6mm
A.2mm B.3mm C.4mm D.1mm
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