Methods At random law select examples implement at experiment group, traditionattend to lying-in woman lying-in woman No. 200 at contrast group practise midwifery practise midwiferyresponsibility.
方法随机法选200例实行责任助产产妇为实验组，传统护理助产产妇200例为对照组。
By using the role and the drafting methods, projective contour line of a quadric at random position can be drawn.
利用这一规律和作图方法，可以解决任意位置的非退变二阶曲面的投影轮廓线的作图问题。
Methods In each province, 3 counties were selected at random in each prefecture, 1~3 villages were selected at random, total 30 village were selected.
方法各省在每个地级行政区划单位随机抽取3个县，每个县随机抽取1～3个行政村，全省总数不少于30个。
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