有关椎间盘变性不正确的是() ["20岁以下髓核含水量85%~90%","变性时,含水量减少,至老年降为70%","变性的椎间盘以低信号为主","变性椎间盘内可有混杂不规则、斑点状信号","椎间盘变性一定都有椎间盘脱出"]
成骨型转移瘤最常见的原发灶是() ["肾癌","肝癌","肺癌","甲状腺癌","前列腺癌"]
离繁忙的高速公路200米处测得的噪声声压级为82dB,假定它符合线状源辐射特征,则在600米处的噪声级为()。 ["4.8dB","6.4dB","7.2dB","9.6dB"]
传统型失范行为
学生心理障碍
简述围绝经期综合征