工厂制造的真空灭弧室真空度要求达到（）以下。A、7.5×10－4Pa B、133Pa 发布时间：2017-07-14 07:18 │ 来源：www.tikuol.com 题型：单项选择题 问题： 工厂制造的真空灭弧室真空度要求达到（）以下。A、7.5×10－4PaB、133PaC、6.3PaD、133×10－4Pa
题型：单项选择题 完形填空。Mrs Jones: Which meal do we need most, breakfast, lunch or 1 ? Tony: Dinner. Mrs Jones: Dinner is the big meal of the day. But I don't 2 we need it most. Tony: Is lunch the meal we want most? Mrs Jones: No, 3 is the meal we need most. But why? Kate: It is a long time from night to morning. We have no 4 . Mrs Jones: Right! If we don't have breakfast, we don't feel 5 . But what makes a good breakfast? James: I think we can 6 milk, bread, noodles or porridge. 7 are good for breakfast. Mrs Jones: That's right. We can eat some vegetables and fruits 8 the morning, too. They make us healthy. David: I 9 coca cola a lot. Can I have that in the morning? Mrs Jones: You'd better not. Water is good for you. Danny: Mum says we can not eat too much things after 10 .Mrs Jones: Great, Danny. It may make you sick. After sports you need water and a rest first, not lots of food. ( )1. A. fruits ( )2. A. like ( )3. A. breakfast( )4. A. water ( )5. A. good ( )6. A. take ( )7. A. You ( )8. A. for ( )9. A. eat ( )10. A. school B. food B. know B. lunch B. food B. great B. make B. They B. in B. bring B. lunch C. dinner C. think C. dinner C. vegetables C. well C. have C. We C. on C. like C. sports 查看答案
题型：单项选择题 古生物学家在地层中发现了三趾马的化石，三趾马的化石的发现证明了（）A.生物是由原始的单细胞生物进化来的B.现代马是由三趾马进化来的C.各种生物结构的进化趋势是从复杂到简单D.古代马体型小，现代马体型大，因此生物进化是由小到大 查看答案