(a) Calculate the sales tax payable or refundable to Zubair Enterprises Ltd, for the month of June 2010, giving explanations for treatment of:– the trade discount allowed to unregistered persons;– the goods given to the Chief Executive;– the input tax on the machinery purchased for the manufacture of goods meant for export only; and– the input tax not claimed in the return for November 2009. (7 marks)

甲状腺大部切除术后造成室息的原因有

A．切口内出血，造成血肿

B．喉头水肿

C．双侧喉返神经损伤

D．气管软化塌陷

E．甲状旁腺误被切除