放化疗后，有关骨髓的描述错误的是() ["A．最初反应为充血、水肿","B．急性期后红骨髓增加","C．急性期后骨髓主要成分为脂肪","D．MRI有助于观察骨髓变化","E．不应选择CT观察骨髓变化"]
有关脂肪瘤的MRI表现，错误的是() ["A．TWI为高信号","B．TWI信号强度高于肌肉","C．STIR序列为高信号","D．MRI表现具有特异性","E．病变周围边界清晰"]
着床的必备条件有哪些?
关于膝关节十字韧带撕裂的描述，错误的是() ["A．形态呈波浪状","B．韧带内可见高信号","C．正常韧带轮廓分裂","D．横轴位易于显示","E．检查时膝关节应摆轻度外旋位"]
椎体骨折在急性期发生水肿，MR图像上是() ["A．T1加权像低信号，T2加权像高信号","B．T1加权像低信号，T2加权像低信号","C．T1加权像高信号，T2加权像高信号","D．T1加权像等信号，T2加权像等信号","E．T1加权像等信号，T2加权像低信号"]
胎盘的功能有哪些?当胎盘受损时对胎儿有何影响?
