利用UITableView来实现下拉列表（可扩展列表）的效果。下拉列表即支持列表每一行的展开与收起功能。点击列表某一行，会下拉显示更多行，再点击一次，即收起下面的所有行。 注意：请在Mac下解压使用

高清Python第三版英文 In Core Python Applications Programming, you will take all the Python knowledge gained elsewhere and develop new skills, building up a toolset with which you’ll be able to use Python for a variety of general applications. These advance

The book R in Action by Robert Kabacoff is a very good introduction to R. This short review will highlight several strong points of the book, and also mention a number of shortcomings which unfortunately detract from what is overall a very commendab

This document defines the specification for WMM, an 802.11 quality of service (QoS) implementation based on a subset of the draft 802.11e standard supplement [2]. It is motivated by the need to prevent market fragmentation caused by multiple, non-in