interactive whiteboard cost. Visit , complete pre-designed survey projects , and finally , a way to derive survey results from statistical analysis. The survey has a strong scientific , which in addition to the affected sample selection, statistical methods, investigators their own quality and other factors , questionnaire design perfect , should be one of the prerequisites to do market research. Before the design of the questionnaire , we should have a certain understanding of the background of the consumer goods to be understood, market conditions, etc. , and be aware of the investigation process and the psychological state of the respondents , and absolutely prohibit closed doors ( see attached table ) .. The IQAio GR519 is an upgraded lightweight version based on the original IQAio GR511. The original dual-cavity structure was changed to a bottom-edge structure, so that the minimalist design accommodates modern classrooms and conference rooms. With one IQProjector V2 and one IQView E3821, you can achieve flexible and intelligent classroom.