治疗坐骨神经痛的最佳体位是:
A.俯卧位
B.仰卧位
C.侧卧位
D.坐位
E.站位
参考答案:C
There was nothing to do but _____ till mother came back. [ ]
A. waited
B. waiting
C. to wait
D. wait
恒定混合策略和投资组合保险策略是消极型资产配置策略。()