雷诺现象或雷诺病发病的病理生理机制为()
A.手指足趾小动脉间隙性痉挛
B.末梢细小动脉对寒冷反应性痉挛
C.淋巴水肿
D.静脉痉挛导致淤血
E.小动脉扩张
参考答案:A
The hospital________well, where many wounded________every day. [ ]
A. is operated; operation
B. operates; are operated on
C. operates; are operated
D. operates; operates on
我国风能利用的发展阶段,其中的主要设备采用的是()设备并由国外政府()协助完成。