读“地震波传播速度和地球结构图”,完成1~2题。 1、关于地震波的叙述,正确的

题型:选择题

问题:

读“地震波传播速度和地球结构图”,完成1~2题。

1、关于地震波的叙述,正确的是[     ]

A、④通过固体、液体传播,③的传播只能通过液体

B、④和③传到②时,波速突然下降

C、④和③传到①时,波速明显减小

D、①②之间为固体,所以纵波和横波都能通过

2、①上下两侧名称分别为[ ]

A、地幔和地壳

B、岩石圈和地壳

C、地幔和地核

D、地壳和地幔

考点:地球的内部圈层
题型:选择题

Muzak

The next time you go into a bank, a store, or a supermarket, stop and listen. What do you hear?  小题1:  It's similar to the music you listen to, but it's not exactly the same. That's because this music was especially designed to relax you, or to give you extra energy. Sometimes you don't even realize the music is playing, but you react to the music anyway.

Quiet background music used to be called "elevator (电梯) music" because we often heard it in elevators. But lately we hear it in more and more places, and it has a new name "Muzak". About one-third of the people in America listen to "Muzak" everyday. The music plays for 15 minutes at a time, with short pauses in between. It is always more lively between ten and eleven in the morning, and between three and four in the afternoon, when people are more tired.    小题2: 

If you listen to Muzak carefully, you will probably recognize the names of many of the songs. Some musicians or songwriters don't want their songs to be used as Muzak, but others are happy when their songs are chosen. Why?  小题3: 

Music is often played in public places because it is designed to make people feel less lonely when they are in an airport or a hotel. It has been proven that Muzak does what it is designed to do. Tired office workers suddenly have more energy when they hear the pleasant sound of Muzak in the background. 小题4: Supermarket shoppers buy 38 percent more groceries.

 小题5:. They say it's boring to hear the same songs all the time. But other people enjoy hearing Muzak in public places. They say it helps them relax and feel calm. One way or another, Muzak affects everyone. Some farmers even say their cows give more milk when they hear Muzak!

A.Some people don't like Muzak.

B.The music gives them extra energy.

C.Music is playing in the background.

D.Factory workers produce 13 percent more.E. Muzak tends to help people understand music better.

F. They get as much as $4 million a year if their songs are used.

G. Muzak is played in most of the big supermarkets in the world.

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光电光比色计所产生的电流与光的强度成反比.

题型:选择题

强心苷可用于治疗

A.慢性心功能不全

B.心房纤颤

C.心房扑动

D.阵发性室上性心动过速

E.室性心动过速

题型:选择题

下列药材中,花粉具单萌发孔的是( )。

A.辛夷
B.丁香
C.洋金花
D.金银花
E.蒲黄

题型:选择题

维修记录应一式两份,一份由维修人员自己保存,另一份带回交工程维修单位存档。()

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