脊髓损伤的病理分型有哪些?
参考答案：
按脊髓损伤的部位和程度，可分为脊髓震荡、脊髓受压、脊髓挫伤与出血和脊髓断裂。
The student sat there, __________ what to do. [ ]
A. doesn't knowing
B. didn't knowing
C. not know
D. not knowing
A．星期二 B．星期三 C．星期六
