填料塔常用的塔填料可分为两类（）和（）。

阿米巴肝脓肿外科手术引流的指征是（）

A.脓肿有可能破溃

B.内科治疗疗效欠佳

C.脓肿穿破引起化脓性腹膜炎

D.脓肿靠近体表且体积较大

E.一经确诊为肝阿米巴脓肿，均应立即手术治疗

（8分）为了判断一个小铁球是不是空心的，小明同学用天平、量筒和水测得如下数据：

铁球的质量m/g	量筒内水的体积V水/mL	量筒内水和铁球的总体积V总/mL
790	200	350

⑴通过计算判断该小铁球是空心的还是实心的？

⑵若小铁球是空心的，则空心部分的体积为多大？

⑶若在小铁球的空心部分注满水，则整个铁球的总质量是多少？（ρ_铁=7.9×10³kg/m³)

Sid is a director of two listed public companies in which he has substantial shareholdings: Trend plc and Umber plc. The annual reports of both Trend plc and Umber plc have just been drawn up although not yet disclosed. They show that Trend plc has made a surprisingly big loss and that Umber plc has made an equally surprising big profit. On the basis of this information Sid sold his shares in Trend plc and bought shares in Umber plc. He also advised his brother to buy shares in Umber plc.Vic who is also a shareholder in both companies sold a significant number of shares in Umber plc only the day before its annual report was published.Required:

(a) Analyse the above scenario from the perspective of the law relating to insider dealing; (8 marks)

长途光缆线路的割接主要是确保用户的通信不中断，为此，长途线路的割接一般应安排在周末的（）点到（）点进行。

阅读下面代码 public class Test2 { 　public static void main(String args[]) { 　System.out.println(5/2)；} } 其执行结果是______。