单项选择题 Since posters are mostly made by plate printing and posted in public places and shops inside and outside, designers should make the poster resolution as high as ____ when designing to ensure the quality of printing. A、72 dots/inch B、300 dots/inch C、200 dots/inch D、150 dots/inch
问答题 工程防护有 ( ) ( ) ( ) ( ) ( ) 五种。
单项选择题 技术是一个动态系统,它是人类为了满足自身对物质生产、精神生产以及非生产活动的需求、愿望和社会需要,遵循自然和社会规律,在利用、控制和改造自然的实践活动过程中,所创造的一切劳动手段、工艺方法和知识体系的总和。( )