要求在图上能表示出0.5m的精度，则所用的测图比例尺至少为（）。 ["1\/500","1\/5000","1\/50000","1\/10000"]
How should you signal the crane operator to raise the boom?（）. ["Extend arm with the thumb pointing up and flex the fingers in and out","Place both fists in front of the body with the thumbs pointing upward","With forearm vertical and forefinger pointing up,move hand in small horizond circles","Extend arm with the fingers closed and thumb upward"]
（）就是按照一定的研究目的，通过运用各种科学的方法和经验研究手段，有步骤地实地考察有关的现象，收集大量的、具体的事实，在对这些资料进行定性和定量分析的基础上，探索现象发生、发展、变化的规律的一种自觉认识活动。 ["实验研究方法","调查研究方法","实地研究方法","理论研究方法"]
How should you signal the crane operator to stop in an emergency?（）. ["Extend arm with the palm down and and hold this position rigidly","Place clasped hands in frontof your body","extend arm and move hand rapidly right and left with the plam outward","Place both fists in front of the body with the thumbs pointing outward"]
请写出儿保规范门诊要求的门诊设施10种。
孕产妇死亡的定义是什么？
