某医院口腔科对其科室工作人员进行了窝沟封闭防龋措施的培训。涂布封闭剂时注意不要() ["A.调拌均匀","覆盖全部酸蚀面","涂布均匀","窝沟内气泡","固化良好"]
轻度营养不良体重低于正常的() ["10%以下","10%~20%","15%~20%","15%~25%","20%~30%"]
对经济发展不同地区按比例抽取样本研究其对就医行为的影响的抽样方法为() ["系统抽样","整群抽样","单纯随机抽样","分层抽样","以上都不是"]
下列中度营养不良患儿的表现中,正确的是() ["A.体重减轻40%以上","B.全身皮下脂肪消失","C.皮肤干燥、面色苍白","D.肌肉萎缩","E.烦躁与抑制交替"]
在常用的几种抽样方法中,最便于组织并且节省经费的是() ["单纯随机抽样","分层抽样","整群抽样","机械抽样","单纯随机抽样和机械抽样"]
针对残疾的基本对策是____、____。