看看 看看****

什么官方？

到底多了什么？

是作者Abraham Weishaus给出的资料.
For C/4, current edition for October 2013 is 16th edition. This edition incorporates changes made to the syllabus for the October 2013 syllabus. This is the first change made since 2009. If you have an earlier edition, you may download a supplement.

There are three sets of new material:
1. Section 8.5 is to be added at the end of lesson 8. No exercises are provided for this material.
2. Lesson 28 replaces the corresponding lesson in the 15th edition.
3. Lesson 61 is a new lesson and comes between lesson 60 and lesson 61 of the 15th edition.