用火作业区距所建的建筑物和其他区域不得小于( )m。 A.15 B.25 C.3 发布时间:2018-01-16 18:10 │ 来源:www.tikuol.com 题型:单项选择题 问题: 用火作业区距所建的建筑物和其他区域不得小于( )m。A.15 B.25C.35 D.45
题型:单项选择题 单句改错 (每句均有一处错误) 。1. I have bought the bike for half a year.2. This long river runs across my village.3. We have written these reports since nine hours this morning.4. This is very nice of you to say so, Many thanks.5. People all over of China got to know the good news.6. The woman has come here for a long time.7. I think I’ve gone to there once.8. What are the two girls talk about?9. The old man has died since two years ago.10. In the morning of May 2, they left for Beijing.____________________________________________________________ 查看答案
题型:单项选择题 下列有关呼吸困难的叙述,正确的是()A.支气管哮喘通常表现为呼气性呼吸困难B.慢性阻塞性肺病(COPD.通常是吸气困难C.喉头水肿常出现呼气相喘鸣D.ARDS患者的呼吸窘迫,面罩给氧即可缓解E.肺栓塞患者呼吸困难通常伴有低氧和二氧化碳潴留 查看答案
题型:单项选择题 如图所示,光滑水平平台上有一个质量为m的物块,站在地面上的人用跨过定滑轮的绳子向右拉动物块,当人以速度v从平台的边缘处向右匀速前进了位移s,不计绳和滑轮的质量及滑轮的摩擦,且平台边缘离人手作用点竖直高度始终为h,则A.在该过程中,物块的运动可能是匀速的B.在该过程中,人对物块做的功为 C.在该过程中,人对物块做的功为D.人前进s时,物块的运动速率为 查看答案