干式灭火系统的管道充水时间不大于（）MinA.0.5 B.1.0 C.1.5 D.2 发布时间：2017-10-01 05:50 │ 来源：www.tikuol.com 题型：单项选择题 问题： 干式灭火系统的管道充水时间不大于（）MinA.0.5B.1.0C.1.5D.2.0
题型：单项选择题 从方框中选择合适的句子填入文中空白处，使对话完整。A: Good afternoon, 1_____ B: Good afternoon! I'd like to buy a T-shirt. A: We have some great T-shirts in all sizes. 2_____ B: Size M. A: What about the color? B: I like blue best. A: Size M, blue one. Here you are. B: Can I try it on? A: 3_____ Is it all right?B: Yes it is. 4_____ A: 56 yuan . B: I think it's a little expensive. Would you mind giving me a cheaper one? A: Not at all. What about this one? It's only 35 yuan. B: OK. 5_____A: Thank you. A. How much is it? B. What size do you wear?C. Can I help you? D. I'll take it. E. Certainly. 查看答案
题型：单项选择题 “脚印”、“笑脸”、“五环”，让北京奥运会开幕式更加辉煌、浪漫，这与高中化学中“焰色反应”知识相关．下列说法中正确的是（ ）A．非金属单质燃烧时火焰均为无色B．NaCl与Na2CO3灼烧时火焰颜色相同C．焰色反应均应透过蓝色钴玻璃观察D．只有金属单质灼烧时火焰才有颜色 查看答案