官营手工业长期占据中国古代手工业的主导地位，其产品(     )

分析材料回答下列各题。
材料一、

材料二、故帝国主义者及卖国军阀之势力不被推翻，则不但统一政府之建设永无希望，而中华民国唯一希望所系之革命根据地，且有被帝国主义者及卖国军阀联合进攻之虞。本党为实现中国人民之唯一的需要——统一政府之建设——为巩固国民革命根据地，不能不出师以剿除卖国军阀之势力。
请回答：
（1）材料一中的“陆军军官学校”是国共合作后创办的哪所军校？
（2）依据材料二，国民革命军出师北伐的原因是什么？北伐的目的是什么?
（3）材料二中的卖国军阀是哪些人？

    Lots of men and women go shopping on Black Friday in the USA and other western countries．Supermarket gives discounts（折扣）of up to 70%．It's a big shopping day in the USA and it____ into Britain five years ago．On that day，the police go to the supermarkets and shoppers are there．The police are worried that the supermarkets are too____With the help of the police，shoppers can get in and out of the supermarkets safely．

    Shoppers in the UK are happy on Black Friday____the clerks in the supermarkets are not．Because they are very tired on that day．On the US____of Thanksgiving，people spend it with their family．Many big stores aren't open on that day．There are over 60 letters on the website Change，org．All of ____show that they want Black Friday to change．They think family is more important than profits（利润）．

名著阅读。

Rt△ABC中两条直角边分别为6cm，8cm，则外接圆半径为____ ．