15 g A物质和10.5 g B物质完全反应生成7.2 g C物质和1.8 g

题型:选择题

问题:

15 g A物质和10.5 g B物质完全反应生成7.2 g C物质和1.8 g D物质和0.3 mol E物质,E物质的摩尔质量为(    )

A.100 g·mol-1

B.111 g·mol-1

C.55 g·mol-1

D.27.5 g·mol-1

考点:物质的量
题型:选择题

下列观点正确说明物质和运动关系的是

A.万物都在运动,但只是在概念中运动

B.世界的发展是“绝对精神”的自我运动

C.物质可以离开运动而存在

D.世界上不存在脱离运动的物质

题型:选择题

客户可以通过网上银行删除其手机银行中所有的手机号码()

题型:选择题

Time spent in a bookshop can be most enjoyable, whether you are a book-lover or merely you are there to buy a book as a present. You may even have entered the shop just to find shelter from a sudden shower. Whatever the reason, you can soon become totally unaware of your surroundings. You soon become engrossed in some book or other, and usually it is only much later that you realise you have spent far too much time there and must dash off to keep some forgotten appointment—without buying a book, of course.

This opportunity to escape the realities of everyday life is, I think, the main attraction of a bookshop. There are not many places where it is possible to do this. You can wander round such places to your heart's content. If it is a good shop, no assistant will disturb you with usual greetings, "Can I help you, sir?" Of course you may want to find out where a particular section is. Then, and only then, are his services necessary. However, when he has led you there, the assistant should retire carefully and look as if he is not interested in selling a single book.

You have to be careful not to be attracted by the variety of books in a bookshop. It is very easy to enter the shop looking for a book on ancient coins and to come out carrying a copy of the latest best-selling novel. This sort of thing can be very dangerous. Apart from running up a huge account, you can waste a great deal of time wandering from section to section.

小题1:.

. Which may not be included in the writer's experiences while he is in a bookshop?

A.Getting relaxed without buying a book.

B.Quarrelling with the shop assistant.

C.Buying other books instead of those he wanted.

D.Forgetting some important appointment.小题2:.

. What does the writer mean by saying "time spent in a bookshop can be most enjoyable"?

A.You may free yourself from the real life.

B.Reading is free of charge there.

C.There is nobody disturbing you there.

D.You can enter without any certain reason.小题3:.

What does the underlined wordengrossed most probably mean in the first paragraph?

A.Lost.

B.Forbidden.

C.Puzzled.

D.Impressed.小题4:.

. The writer wrote the passage in order to ________.

A.suggest a good way of running a bookshop

B.encourage people to do some reading in bookshops

C.share his experience in bookshops

D.give some advice on buying books in a bookshop

题型:选择题

设某闭环系统的总传递函数为:G(s)=1/(S2+2S+1),此系统为()

A.欠阻尼二阶系统

B.过阻尼二阶系统

C.临界阻尼二阶系统

D.等幅振荡二阶系统

题型:选择题

EVDORev.A网络中,每一种反向链路数据包大小对应()种传输速率。

A.2

B.3

C.4

D.5

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