Sophomore dog, only the upper computer composition principle, this term feelings meng force instantly, and not on how long the teacher the assignment, asked to complete an electronic product input and output of the system working principle diagram and explanations, and of the container, the treadmill, I chose, up to now still didn't force, the interpretation of the entrance guard system, a great god taught still don't understand, or recommend some books,,, E-mail: 1214688775 @qq.com