单项选择题
A.60mmHg B.65mmHg C.70mmHg D.75mmHg E.80mmHg
A.55mmHg B.60mmHg C.65mmHg D.70mmHg E.75mmHg
A.20mmHg B.30mmHg C.40mmHg D.50mmHg E.60mmHg
A.30~90mmHg B.40~120mmHg C.50~150mmHg D.60~170mmHg E.70~180mmHg
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