【单选题】
有严密的计划，有详细的观察指标体系，对观察情境有较严格的要求，这种教育观察研究的类型是 ( )
①
自然情境中的观察
②
实验室中的观察 采集者退散
③
参与性观察
④
结构式观察
【单选题】
婴幼儿体内生长激素分泌最旺盛的时间段是( )。
①
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②
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③
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④
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