在一个平行四边形里面画一个最大的三角形,三角形的面积是平行四边形的______%

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问题:

在一个平行四边形里面画一个最大的三角形,三角形的面积是平行四边形的______%.

考点:三角形的周长三角形的面积
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下列关于简谐运动和波的说法正确的是(   )

A.简谐运动的平衡位置一定是物体所受合外力为零的位置。

B.横波在介质中的传播速度由波源本身的性质决定。

C.“闻其声而不见其人”说明:声音能发生衍射现象,光不能发生衍射现象。

D.当声波从空气进入水中时,声波的频率不变,波长变长。

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吗啡对瓣膜病变心脏病人的作用表现为()

A.外周阻力不变,血压增加,心排血量增加

B.外周阻力增加.血压增加,心排血量下降

C.外周阻力不变,血压下降,心排血量下降

D.外周阻力降低,血压下降,心排血量增加

E.外周阻力降低,血压下降,心排血量下降

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绝缘杆应倚墙而放,以免碰倒伤其绝缘表面。第七章

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Do you love American country music? If you do, come to Nashville. It’s the home of American country music.

Nashville is the capital city of the state of Tennessee. Here you don’t have to go to the big auditoriums(音乐厅) to enjoy the country music. In the open air restaurants or on the streets, you can always hear the beautiful and sweet sounding folk music. All the singers are young and they play their guitars while they sing. The songs they sing are so touching(动人) that, if you listen attentively, you can feel they are singing with their souls rather than with their voices.

Shops selling music records and tapes can be found everywhere in Nashville. Many records are made by famous singers and they are sent to many countries all over the world.

The folk songs most of the singers sing come form the rural areas in the southern United States. The songs often describe those days to situations and the feeling of the country people. They often sing in praises of heroism(英雄) and true love.

1. From the passage we know Nashville is ________.

A. a village       B. a big city   C. a small town        D. a capital city

2. To enjoy the country music, you can go to ________.

A. the big auditoriums   B. the open air restaurants    C. the streets  D. All of the above

3. According to the passage which of the following statements is not true?

A. Shops that sell music records and tapes can be found everywhere in Nashville.

B. The folk songs can impress you deeply

C. Not all records are made by famous singers

D. The folk songs only sing in praises of heroism and true love.

4. The passage is mainly about ________.

A. Nashville  B. American young people   C. pop singers   D. the country music

题型:解答题

反手截击球在身体前面什么距离接触球()

A、0—15cm

B、0—20cm

C、15—30cm

D、看自己习惯

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