()是指某个地区较长时间降水异常偏少,河川径流及其他水资源短缺,致使土壤水分严重不足 发布时间:2020-02-08 08:38 │ 来源:www.tikuol.com 题型:单项选择题 问题: ()是指某个地区较长时间降水异常偏少,河川径流及其他水资源短缺,致使土壤水分严重不足,对人类生产、生活造成损失和影响的灾害。A.沙尘暴B.土壤沙漠化C.干旱灾害D.气象灾害
题型:单项选择题 连线。l. Who is this? 2. What is Danny doing now? 3. What are you doing now? 4. Is the baby quiet or loud? 5. Who is laughing? 6. Can you look out the window? A. I am drawing pictures. B. This is a woman. C. The young man is laughing. D. He is quiet. E. He is playing with the baby.F. Yes, I can. 查看答案
题型:单项选择题 同一型号的1000台计算机,在规定的条件下工作1000小时,其中有10台出现故障。这种计算机千小时的可靠度R为 (1) ,失效率λ为 (2) 小时,平均故障间隔时间(MTBF)为 (3) 小时。A.1×10-4B.1×10-5C.1×10-6D.1×10-7 查看答案