This paper expounds the technical problems existing in playing family movie system to achieve the audio-visual effect of cinema, giues the main points of how to select family movie system and its spesific disposition.

The paper combined with the course of educational electroacoustic system experiment teaching innovation,discussed the objective of innovation,how to add comprehensive and designed experiments,how to apply modern educational technology instruments,and how to change teaching methods and examining ways.

A electronic teaching-system to descriptive geometry based on AutoCAD;

This paper introduces an electronic teaching-system to descriptive geometry using AutoLISP language provided by AutoCAD 2002 software.

On the limitation of electronic teaching system in human-computer nature interaction and user adaptation,sketch HCI based electronic teaching system is studied and designed.

This paper points out that electronic teaching system of Descriptive Geometry can be developed with the language of AutoLISP supplied by the developmental platform of AutoCAD2002.

It has expounded the design method with local resonance principle by means of the design of flexible lever?oil stone bed vibration subsystem and supplied an easy and effective path for the design of ultrasonic honing acoustic system.

Frequency property of acoustic system in an ultrasonic plastic welder is experimentallystudied, and it is gnatly affected by the working condition and structure of acoustic system.

Ultrasonic machining is used widely in machining hard and brittle materials,the acoustic system is the key part of the power ultrasonic equipment,the quality of design influence application effect directly.