题目

阅读理解 PITTSBURGH — For mostpeople, snakes seem unpleasant or even threatening. But Howie Choset sees intheir delicate movements a way to save lives. The 37-year-old Carnegie Mellon Universityprofessor has spent years developing snake-like robots he hopes will eventuallyslide through fallen buildings in search of victims trapped after naturaldisasters or other emergencies. Dan Kara is president of Robotics Trends, aNorthboro, mass-based company that publishes an online industry magazine andruns robotics trade shows. He said there are other snake-like robots beingdeveloped, mainly at un以下是进行氨氧化制硝酸的实验装置图，有关叙述正确的是（    ） A.烧杯中石蕊溶液不变 B.烧瓶中发生喷泉现象 C.加热后，通过Cr2O3的气体由无色变为红棕色 D.Cr2O3起氧化剂的作用