坐骨神经痛的治疗（）.
A.病因治疗
B.药物治疗
C.封闭疗法
D.物理疗法
E.以上均是
参考答案：E
Schools in the north tend to be better equipped, ______ those in the south are relatively poor.
A．as
B．unless
C．when
D．while
能否用肩部扛仪器设备？
