【单选题】The latest trend in the United States involves rediscovering the benefits of home-cooked food and the use of organic ingredients. People are choosing to spend hours in the kitchen using only the fresh...
【简答题】_在采用YT - 1226压力调节器控制锅炉蒸汽压力的系统中,蒸汽压力将不可控制地超过最高压力,其可能的原因是 。1幅差旋钮设定的格数太大•,2给定弹簧旋钮扭得太紧;3动触头烧蚀不能闭合;4幅差弹簧折断;5输人波纹管破裂;6与锁打相接触的幅差蹲簧盘卡住。A. ③⑤⑥ B. ②④⑥ C. ①②④ D. ①③⑤