关于声的传播,下列说法中正确的是[ ] A.声音可以在真空中传播 B.声速可以大 发布时间:2017-04-27 06:22 │ 来源:www.tikuol.com 题型:选择题 问题: 关于声的传播,下列说法中正确的是[ ]A.声音可以在真空中传播B.声速可以大于光速 C.声音在水中传播比在钢中快D.声音是以声波的形式传播
题型:选择题 完形填空。 Perhaps you have learned a lot 1 the Internet, but what is it, do you know? The Internet is a network. It uses the telephone 2 millions of computers together around the world. Maybe that doesn't 3 interesting. But when you've joined to the Internet, there are lots and lots of things you can do. You can 4 E-mails to your friends, and they can get them in a few seconds. You can also do with all kinds of information on the 5 There are many different kinds of computers now. They all can be joined to the Internet. Most of them are small machines 6 on people's desks at home, but there are still many 7 in schools, offices or largecompanies. There are lots of places for you to 8 the Internet. For example, your school may have the Internet. You can use it during lessons. Thanks to the Internet, the world is becoming 9 . It is 10 for you to work at home with a computer in front, getting and sending the information you need. You can buy or sell whatever you want by the Internet. But do you know 98% of the information on the Internet is in English? So what will English belike tomorrow? ( )1. A. of ( )2. A. to join ( )3. A. hear ( )4. A. get ( )5. A. Wide World Web ( )6. A. sit ( )7. A. other ( )8. A. go into ( )9. A. larger and larger( )10. A. important B. about B. join B. listen B. receive B. World Wide Web B. sat B. the other B. go to B. smaller and smaller B. useless C. / C. joining C. sound C. give C. Wide Word World C. sitting C. another C. go C. stronger and stronger C. impossible D. at D. joined D. listen to D. send D. Wide Window World D. to sit D. others D. enter into D. older and older D. possible 查看答案
题型:选择题 关于收费员月度考核说明,错误的是()。A、出现旷工行为和发生责任投诉事件均属否决条件B、凡当月绩效考核连续两次被评定为不合格的,且屡教不改者,予以待岗处理C、在年度考核期内,凡出现三次以上不合格的,且工作不明显改观的,予以不续签合同D、差错率超标属否决条件 查看答案
题型:选择题 水是我们生活中最普通、最常见的物质之一。(1)下列生活中的“水”属于纯净物的是 (填序号)。A.湖水 B.雨水 C.蒸馏水 D.地下水(2)保护水环境、珍爱水资源,是每个公民应尽的责任和义务。下列做法有利于保护水资源的是 (填序号)。A.大量使用化肥农药 B.工业废水处理达标后排放C.使用含磷洗衣粉 D.生活污水直接排放(3)要证明某水样是硬水还是软水,可向其中加入 。(4)利用下图装置我们认识了水的组成,试管“1”中的气体是 ,写出此反应的化学方程式 ,此反应的基本反应类型属于 。(5)水是常见的溶剂,将200克30%的氢氧化钠溶液稀释成10%的溶液用于制作叶脉书签,需加水 ml。 查看答案