粉碎性骨折是指骨折断裂达几块之上的骨折() ["1","2","3","4","5"]
简述流行性腮腺炎
放化疗后有关骨髓的描述错误的是() ["最初反应为充血、水肿","急性期后红骨髓增加","急性期后骨髓主要成份为脂肪","MRI有助于观察骨髓变化","不应选择CT观察骨髓变化"]
测量噪声时,除被测噪声源以外,周围还存在与被测噪声无关的环境噪声。为了保证测量结果的准确性,应首先测量()。 ["反射声","风噪声","背景噪声","电磁场"]
骨肉瘤主要的转移途径为() ["血行转移","淋巴转移","跳跃性转移","消化道转移","种植转移"]
简述终身教育观念和理论的要点。