关于水循环地理意义的正确叙述是（） ["A.使水呈三态变化","B.加速了冰川的融化","C.造成海平面下降","D.促使能量转换和物质迁移"]
How should you signal the crane operator to lower the boom and raise the load?（）. ["Extend arm and point finger in the direction to move the boom","Extend arm with the thumb pointing downward and flex fingers in and out","With f rearm vertical and forefinger pointing up,move hand in small horizond circles","With arm extended downwards and forefinger pointing down,move hand in small horizontal circle"]
（）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。 ["重点访谈","深度访谈","客观陈述法","座谈会"]
死胎死产的区别是什么？
人民币七天通知存款起存金额为（）元，多存不限。 ["A.100000","B.50000","C.20000","D.10000"]
高危妊娠的定义是什么？
