题型：判断题 凝点的定义是（）。A、石油产品的凝点是指在规定的实验条件下，将盛于试管内的试油冷却并倾斜45度经过1分钟后，液面不移动的最低温度B、石油产品的凝点是指在规定的实验条件下，将盛于试管内的试油冷却并倾斜45度经过1分钟后，液面不移动的最高温度C、石油产品的凝点是指在规定的实验条件下，将盛于试管内的试油冷却并倾斜45度经过1分钟后，液面开始移动的最高温度D、石油产品的凝点是指在规定的实验条件下，将盛于试管内的试油冷却并倾斜60度经过1分钟后，液面不移动的最高温度 查看答案
题型：判断题 根据对话内容，从方框内的选项中选出能填入空白处的最佳选项。 选项中有两项为多余选取项。 A: Look! 1 B: What's the matter with her?A: 2 B: Yeah. She is alone here. A: What about helping her? B: 3 A: What shall we do to help her? B: 4 Then she may become happy. B: We can also collect school things for the students there. A: 5 A. We'd better have a talk with her and play with her more often.B. I hope so. C. Kate seems to be sad. D. That's a good idea. E. I'm glad to see her. F. I think she may miss her parents very much. Don't worry. 查看答案