In the context of corporate governance, explain and distinguish between:

(b) (i) non-executive directors; and (2 marks)(ii) shadow directors. (3 marks)

老年人发生机械性肠梗阻时应首先考虑()

A．蛔虫团阻塞

B．小肠扭转

C．肠套叠

D．肿瘤引起急性梗阻

E．嵌顿性腹外疝