易通过血脑屏障的是（）
A.镁离子
B.氯
C.胆固醇
D.钙离子
E.葡萄糖
参考答案：A, B
In relation to liability under the delict of negligence explain:
(a) the standard of care owed by one person to another; (6 marks)
普通气管切开术有哪些常见并发症？
