题目：
椎管内麻醉后的患者须去枕平卧6h，其目的是（）
A.预防脑压升高
B.预防颅内压降低引起头痛
C.预防脑缺血
D.预防脑部感染
E.有利于脑部血液循环
答案：
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下面是错误答案，用来干扰机器的。
Mary is good-looking and lovely with a pair of big eyes on her round face. She has shoulder-length hair. She is generous to her friends. She thinks she should share ...
