终池
参考答案：
脊髓蛛网膜下隙自脊髓下端至第2骶椎水平特别宽阔，称终池，临床上常在此作腰椎穿刺。
.
The company has changed some of its working practices__________complaints and criticism from the customers.
A．in respect to
B．in return for
C．in exchange for
D．in response to
题21图所示电路稳定，t=0时打开开关S，则电感电流iL（O+）应为（）mA。
A.0
B.4
C.7.5
D.8
