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教学演示设备是教室和实验室中的基本设备，各种新涌现的设备有其技术特点，教学的选用需要对其有所了解和认识。１投影机投影机已经在普遍使用。它与微机相连接，能把在微机显示屏上显示的文字或图像，同时投影到银幕上，使教学演示很直观，而且方便。老式的三枪式CRT投影机已
Teaching demonstration equipment is the basic equipment in the classroom and laboratory, a variety of emerging equipment has its technical characteristics, the selection of teaching needs to be aware of and understanding. 1 Projector Projector is already in widespread use. It is connected with the computer, can display text or images on the computer screen, while projected onto the screen, so that the teaching demonstration is very intuitive and convenient. Old-style three-shot CRT projector has been