请按氮元素的化合价由低到高将下列物质排序。
①NO2 ②NO ③NH3 ④HNO3(硝酸)⑤NaNO2(亚硝酸钠)⑥N2
_________ (填序号)
③⑥②⑤①④
In relation to the capital and financing of shareholding companies:
(a) Explain the limitations imposed by the Law on Enterprises in respect of the payment of dividends. (5 marks)
叙述胃腕痛的基本治法