【多选题】【消耗次数：1】
学前儿童泌尿系统的特点有（ ）。
①
各生殖器官生长发育缓慢
②
肾脏功能较差
③
尿路易发生感染
④
控尿能力差，排尿次数多
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学前儿童生长发育的一般规律有（ ）。
①
生长发育是有阶段性和程序性的连续过程
②
生长发育的速度呈波浪式
③
个体间身体各部分增长的比例和发育程序相同
④
身体各系统的生长发育不平衡，但统一协调
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