女性，45岁。头痛2天，今日出现恶心、呕吐。查体：血压190／110mmHg，对疼痛刺激有痛苦表情。角膜反射、瞳孔对光反射、咳嗽反射均存在。其意识障碍属于（）

A.轻度昏迷

B.昏睡

C.嗜睡

D.中度昏迷

E.重度昏迷

In the Ethernet LAN, an algorithm was chosen to dynamically adapt to the number of stations trying to send. It is called

A．backward learning

B．binary exponential backoff

C．spanning tree

D．CRC