【单选题】The symbolic connection of a word to a particular thing is almost always ______.
【判断题】对于电动机绕组为Δ形接法的电动机 需采用 带断相保护的热继电器。
【简答题】20世纪上半期世界经济发展的不成熟性表现在哪些方面?
【单选题】Like many other social problems in contemporary America, the wide gap between men and women in jobs and earnings is often regarded as an ___________ fact of life.
【简答题】反映底面实形的试图为圆,其他试图均为等腰三角形,则该视图为[(填空(1))].A. 圆锥
【判断题】硫酸亚铁铵使用时当天标定的原因是由于亚铁离子的不稳定,容易被氧化。()
【单选题】He went to his uncle's house _____ goodbye _____ them. [ ]