【单选题】
关于婴幼儿关节和韧带的特点及保育的说法不正确的是
①
婴幼儿肘关节较松
②
勿用力牵拉孩子的手臂，以防伤着肘关节
③
脚底的肌肉、韧带较结实
④
为促进脚弓的形成应进行适度的运动
【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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