请输入或粘贴题目内容
搜题
拍照、语音搜题，请扫码下载APP
题目内容
（请给出正确答案）
A.Models of the first planes used for mail delivery.
B.A copy of a railway mail car.
C.All the unusual stamps.
D.A motorbike.
答案
更多“A.Models of the first planes used for mail delivery.B.A copy of a railway mail ca”相关的问题
第1题
A．Models of the first airplanes used for mail delivery.
B．Replicas of railway mail cars.
C．Historical stamps.
D．Engravings of nineteenth-century railroad scenes.
第2题
A.He began rehearsing it last week.
B.It is a very famous piece.
C.He first heard it last week.
D.He found out about it in a music class.
第3题
A.Flexibility
B.Empowerment/Accountability
C.Quality Firs tMentality
D.Accountability
第4题
A.Escalation
B.Empowerment/Accountability
C.Quality Firs tMentality
D.Accountability
第5题
What can we know about the giant chipmaker, Intel in the passage？
A.It did not issue first-quarter forecast for great decrease in January.
B.Inters chain store used to report sales estimates by year.
C.Only retailers and chipmakers are greatly influenced.
D.Intels profit was greatly decreased in 2008s last quarter.
第6题
What do we learn about the reality TV show "Block Party" from the passage？
A．It is the first reality show on CBS.
B．It will be produced by Magical Elves.
C．It has been approved by Jennifer Bresnan.
D．It will be broadcast before the "Marriage" show.
第7题
B: Yes, Professor Smith. We did.
S: Who's your lab partner, Bob？
B: Anne Wilson.
S: Well, Anne, can you and Bob go over the procedure for the class？
A: Sure. Firs(we put ten grams of crushed limestone in a bottle.
S: Anything special about the bottle？
B: It was a gas - collecting bottle with a one - hole stopper and bent glass tubing.
S: Very good. So you put the limestone in a gas - collecting bottle. Then what？
A: Then we poured in ten milligrams of hydrochloric acid, put on the stopper, and collected a bottle of carbon dioxide.
S: Right, What was the method of collection？
A: Water displacement.
S: Good.
A: Then, we lit a magnesium ribbon and put it in the bottle or carbon dioxide.
B: And carbon deposits began to form. on the bottom of the bottle, You see, we didn't have any problem with procedure.
A: Well, we had a little problem getting the magnesium ribbon to stay lit until we could get it into the bottle.
B: Okay. But we did it. The big problem was that we really didn't understand what happened. Did the magnesium combine with the oxygen in the carbon dioxide？
S: You have just answered your own question, Bob. The burning magnesium broke the carbon - oxygen bonds in the carbon dioxide, and then the oxygen combined with the magnesium to produce magnesium oxide.
A: And the carbon was freed to deposit itself on the bottle.
S: Exactly.
(23)
A．To discuss the results of the lab experiment.
B．To answer Bob' s question about the lab experiment.
C．To explain the method of collection by water displacement.
D．To prepare the students to do the lab experiment.
