MRI检查不能清楚显示的组织是（）
A.心肌
B.心内膜
C.心房和心室
D.肺动脉干
E.含气肺组织
参考答案：E
Justin a book about his adventures in Tibet．I hope he can find a good publisher when it is finished．
A．was writing
B．is currently writing
C．has already written
D．wrote
牙槽突骨折的典型临床症状是（）
A.摇动损伤区中某一牙，其余牙随之移动
B.牙龈肿胀
C.牙龈撕裂
D.牙松动移位
E.咬合错乱
