【简答题】The reporter said that the UFO ______ from east to west when he saw it. A) was traveling B) traveled C) had been traveling D) was to travel
【单选题】普通混凝土立方体强度测试,采用100mm*100mm*100mm的试件,其强度换算系数为()
【判断题】概念设计、改良设计和创新设计是截然不同的设计分类。
【简答题】产品改良设计程序的 主要目的是改进产品中 和 , 改良型号、花色和细节等 、 设计任务,满足市场对产品多样化的需求。