视觉形成的过程中，形成物像和形成视觉的部位分别是[ ] A．大脑皮层、大脑皮层

声幅找窜是利用声幅在水泥与套管固结好的地方比固结差的地方衰减的小，确定是否窜槽。

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Dear Customers，

I love slipping into a comfortable chair for a long read —as I relax into the chair，I also relax

into the author’s words，stories，and ideas．The physical book is so elegant that it disappears into

the background，and what remains is the author’s world．

Today，we at Amaｚon are excited to announce Mindle，a wireless，portable reading device with instant access to more than 90，000 books，magazines，and newspapers．

We’ve been working on Mindle for more than three years．Our top design objective was for

Mindle to disappear in your hands —to get out of the way —so you can enjoy your reading．We

also wanted to go beyond the physical book．Mindle is wireless，so whether you’re lying in bed or riding a train，you can think of a book，and have it in less than 60 seconds．No computer is needed—you do your reading directly from the device．

We chose the same wireless technology used in advanced mobile phones．But unlike mobile

phones，there are no monthly wireless bills，no service or data plans，and no yearly contracts．There

is no software to install．We want you to get lost in your reading and not in the technology．

Mindle uses a new kind of display called electronic paper．Sharp and natural with no strong

light，reading on Mindle is nothing like reading from a computer screen．Mindle weighs only 10.3

ounces —less than a paperback —but can carry two hundred books．

Enjoy learning about Mindle and many thanks！

60．This passage most probably is a（n）_________．

A．advertisement B．news story       C．lab report        D．letter of thanks

61．From the passage we learn that Mindle is a device（设备）which．

A．has neither wires nor weight B．is operated by a computer

C．disappears while you read      D．can find a book within one minute

62．With the device，the reader is able to      ．

A．enjoy reading when driving a car   B．improve reading skills

C．gain access to free software       D．get rid of heavy books made of paper

63．Different from mobile phones，Mindle_________．

A．has a much more friendly screen   B．can work in the absence of electricity

C．doesn’t involve regular fees      D．is wireless and can be used anywhere

使用止血带后需做出显著的标志，注明上止血带的时间，以便于时间的计算。

下列螺纹中属于连接螺纹的是（）

A.矩形螺纹

B.管螺纹

C.梯形螺纹

D.锯齿形螺纹

绕线型异步电动机电阻愈大，电动机的机械特性愈硬。（）