变幅机构是用来改变起重机幅度的机构。
参考答案:对
His careless driving ___ him his life last year.
A.spent
B.paid
C.took
D.cost.
星状神经节阻滞后出现的症状中,哪个是错的()
A.瞳孔缩小
B.眼睑下垂
C.眼球凹陷
D.球结膜充血
E.出汗