AIM: to develop the teaching videocompactdisc (VCD) Diabetic Retinopathy so as to improve the traditional ophthalmic teaching mode.
目的:研制《糖尿病性视网膜病变》教学VCD,改进传统教学模式。
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Its bandwidth of 428 kilohertz means a single segment can carry a bare-bones video picture, compactdisc-quality audio, and text for news flashes, weather details and emergency announcements.