少枝胶质细胞瘤的常见CT表现为() ["A.斑块状钙化","B.混合密度","C.不规则增强","D.可呈低密度","E.以上都是"]
被动免疫(passiveimmunity)
预防接种(prophylacticvaccination)
1.5~2岁小儿应复种()12岁小儿应复种() ["A.百白破混合制剂","B.乙肝疫苗","C.麻疹疫苗","D.伤寒疫苗","E.脊髓灰质炎疫苗"]
4个月小儿每日睡眠时间应是()12个月小儿每日睡眠时间应是()9个月小儿每日睡眠时间应是()2个月小儿每日睡眠时间应是() ["A.16~18小时","B.15~16小时","C.14~15小时","D.13~14小时","E.12~12.5小时"]
主动免疫(activeimmunity)