题目内容

A3/A4 题型孕妇,27岁,第1胎,孕期检查情况正常。因临产入院待产。现临产4小时。检查:血压正常,宫缩持续30秒,间歇4~5分钟,胎心140次/分;肛查宫口开大2cm,未破膜,头先露在坐骨棘水平。临产12小时后,产妇进入第二产程,检查:宫缩持续45秒,间歇1分钟。听取胎心应每隔

A. 1次/10分钟
B. 1次/15分钟
C. 1次/20分钟
D. 1次/25分钟
E. 1次/30分钟

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