胃肠道支架置入术的并发症有（）
A.黏膜出血
B.狭窄部水肿
C.幽门梗阻
D.虚脱
E.假道形成
参考答案：A, B, D, E
沙眼
Computer systems consist of two very different types of elements: (71 ) , which includes all the physical things that can be touched and Software, which tells the hardware how to do.
A. Operating system B. I/O devicesC. Courseware D. Hardware
