1、Use life：4 years 2、new and old discrimination：*0% new upon 3、Problem：a bit old 4、Get it time/period/ suit condotion:***5 ,May, should be forever , anywhere Suit for some electronic(computer) basic Assistant computer business book, I have used Help you system get the advandtages of electronic business The contents is detailed , get you into wonderful, Strong practicability. Plug the wings for your study，life and work。Like tiger plug wings.
