农业总产值扣除农业总费用后的余额，称（） ["农业纯收入","农业净产值","农业商品总值","农副产品总值"]
已婚妇女（）周岁以上或者实行晚婚后怀孕生育第一个子女为晚育。 ["23","20","24"]
Changing rescuers while carrying out artificial respiration should be done（）. ["without losing the rhythm of respiration","only with the help of two other people","by not stopping the respiration for more than 5 minutes","at ten-minute interval"]
李达三在事业上取得巨大的成就，他的成功密诀就是：在其创业的历史中，虽苦乐参半，但有三条原则是始终贯彻如一的，下面哪个不是？（） ["待人以诚","与时俱进","勤奋","合理节约"]
农业法规是指国家制定或认可的，并由国家强制力保证实施的，关于农业生产经营的（）的总称。 ["农业行政法规","法律文件","规范性法律文件","法律条文"]
珀赛尔的创作特征主要反映在他的哪部歌剧上？
