影响潜水面形状的因素有哪些?

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问题:

影响潜水面形状的因素有哪些?

考点:水利工程工程水文学工程水文学题库
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一段长为L,电阻为R的均匀电阻丝,把它拉制成3L长的均匀细丝后,切成等长的三段,然后把它们并联在一起,其电阻值为(  )

A.

R
3

B.3R

C.R/9

D.R

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.

Singles Day falls on every November 11th, and as the name indicates, this relatively new holiday is one specially for people who are still living the single life. I was a bit surprised when I googled “Singles Day” on the Internet, to find that China is the only country in the world that has set up a special day for singles to celebrate their lives.

An old story goes that once there were four single men, leading very boring lives. None of them were married, or had lovers, or did anything exciting. They just sat around all day and played Mahjong. One day they played Mahjong from 11 in the morning until 11 at night. During the game, no matter who won, the winning card was always the “four columns” card (the card shows four independent, parallel columns in two lines). Even more of a coincidence, it was Nov. 11. In order to remind them of the day, they nicknamed it Singles Day.

Singles Day was first celebrated at various universities in Nanjing, capital city of Jiangsu Province during the 1990s. These college students carried their university tradition into society after they graduated. Singles Day is now a special day for all.

The main way to celebrate Singles day is to have dinner with your single friends, but it’s important that each person pay their own way to show their independence. People also hold “blind date” parties in an attempt to say goodbye to their single lives.

For breakfast on Singles Day, singles often eat four youtiao (deep-fried dough sitcks) representing the four “ones” in “11.11” and one baozi (steamed stuffed buns) representing the dot in between.

Many singles also choose to say goodbye to their single lives on the day. Many attend “blind date” parties and many people choose to marry on this day. In addition to meaning “single”, the four “ones” of the date can also mean “only one” as in “the only one for me”. Some people will use this date and this meaning to tell their special someone that they are the only “one” in their heart.

45. Which of the statement is TRUE according to the passage?

A. Singles Day has a long history.

B. Only men celebrate Singles Day.

C. Singles Day is only celebrated in China.

D. Students in Nanjing University started Singles Day.

46. People celebrate the festival mainly by       .

A. playing Mahjong             B. having dinner

C. getting married                      D. hanging out with friends

47. What is the best title of the passage?

A. Singles Day

B. Four Single Men’s Singles Day           

C. University Culture on Singles Day                   

D. Symbolic Food on Singles Day

48. Which of the following best shows the structure of the passage?

(a-para.1  b-para.2  c-para.3  d-para.4  e-para.5  f-para.6)  

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小明在学习吉他演奏的过程中,发现琴弦发出声音的音调高低是受各种因素影响的,他决定对此进行研究.经过和同学们讨论,提出了以下猜想:

猜想一:琴弦发出声音的音调高低,可能与琴弦的长短有关

猜想二:琴弦发出声音的音调高低,可能与琴弦的横截面积有关

猜想三:琴弦发出声音的音调高低,可能与琴弦的材料有关

为了验证上述猜想是否正确,他们找到了表中所列几种规格的琴弦,因为音调的高低取决于声源振动的频率,于是小明又借来一个能够测量声源振动频率的仪器进行实验.

(1)为了验证猜想一,应选用编号为______、______的琴弦进行实验.

(2)为了验证猜想二,应选用编号为______、______的琴弦进行实验.

编号材料长度(cm)横截面积(mm2
A600.76
B601.02
C1000.76
D尼龙801.02
E尼龙1000.76

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腹足纲与其它软体动物不同的主要特征是具一牛角状两端开口的贝壳。()

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产后病的治疗应本着哪项原则()

A.补气养血为主

B.活血化瘀为主

C.勿拘于产后,也勿忘于产后

D.疏肝健脾为主

E.滋补肝肾为主

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