1492年,哥伦布航海期间,每天都用船上的象限仪观察北极星,只要α数据为28°,

题型:选择题

问题:

1492年,哥伦布航海期间,每天都用船上的象限仪观察北极星,只要α数据为28°,他就坚信自己航向正确。读图哥伦布航海线路图和所使用的象限仪图,据此回答下题。

小题1:哥伦布每天用象限仪观察北极星,保持28°,是为了

A.顺风航行

B.顺水航行

C.向西航行

D.向西南航行小题2:在航行途中,如果只考虑海水运动,船只行驶较快的是

A.甲航段

B.乙航段

C.丙航段

D.丁航段

考点:洋流的分布规律洋流对地理环境的影响
题型:选择题

一种面粉包装袋上的质量标识为“25±0.5kg”,则下列四袋面粉中不合格的是(  ) [ ]

A.24.5kg

B.25.5kg

C.24.8kg

D.26.1kg

题型:选择题

将一元二次方程5x(x-3)=1化成一般形式为           ,常数项是_______.

题型:选择题

阅读理解

     Below is a selection about Guinness(吉尼斯) World Records.

     Top 6 Unusual Guinness World Records

     Fastest 100 m running on all fours

     The 2008 Guinness World Records Day was, according to CWR, their biggest day of record-breaking ever, I- h more than 290.000 people taking put in record attempts in 15 different countries. Kenichi Ito's

record attempt was port of this special day. He is just another example of Japanese with "super powers". His "super power" is to run with great speed on all fours. Kenichi Ito ran 100 m on all fours in 18.58

seconds. The Japanese set this record at Setagaya Kuritsu Sogo Undojyo, Tokyo, in 2008.

     Most people inside a soap bubble

     The Discovery Science Center in Santa Ana, Califomia celebrated this year the 15th anniversary of

the Bubble (泡泡) Festival. A bubble's math principles and science were presented and demonstrated at

the three-week-long exhibition. The intriguing Bubble Show was also part of the program. Fan Yang

and Deni Yang impressed the audience with their awesome skills for bubble making. The Yang family

cooperated with the Discovery Science Center to set a new Guinness World Record for mow people

inside a scup bubble and they succeeded.

     The family that has been working with soap bubbles for 27 years created a huge soap bubble and got

118 people inside it. The record was set or. April 4, 2011.

     Longest ears on a dog

     A bloodhound from Illinois has the longest ears ever measured a dog. The right ear is 13.75 inches

long and the left one 13.5 inches. The dog named Tigger earned this title in 2004 and is owned by

Christina and  Bryan Flessner.

     Mr. Jeffries is the previous record holder of this title. Each of his ears measured approximately 11. 5

inches long. His grandfather used to hold this amazing world record, but when he died Mr.Jeffries look over.

     Most living generations

     Did you ever wonder what is the Guinness World Record for most living generation in one family?

Seven is the answer.

     The ultimate authority on record-breaking mentions on the website that the youngest

great-great- great-great grandparent of this family was Augusta Bung "aged 109 years 97 days, followed

by her daughter aged 89, her granddaughter aged 70, her great grand-daughter aged 52, her great-great

grand-daughter aged 33 and her great-great-great granddaughter aged 15 on the birth of her

great-great-great-great grandson on January 21, 1989".

     Most T shirts worn at once

     Believe it or not, there is a record also for this category. Krunoslav Budiseli set a new world record

on May 22,2010 for wearing 245 T-shirts at the same time. The nun from Croatia was officially

recognized as the new record bolder by Guinness World Records after he managed to put on 245

different T-shirts in 1ess than two hours. . The T-shirts weighted 68 KG and Budiseli said he began

struggling around T-shirt   No. 120. He dethroned the Swedish Guinness record holder who wore

238 T-shirts.

    Heaviest pumpkin

     Guinness World Records confirmed on October 9. 2010 that a gigantic pumpkin (南瓜) grown in

Wisconcin was officially the world's heaviest. It weighed 1,810 pounds 8 ounces and was unveiled by

Chris Stevens at the Stillwater Harvest Festival in Minnesota. Stevens' pumpkin was 85 pounds Javier

than the previous re I, another huge pumpkin grown in Ohio. The proud farmer said his secret is a

precise of rain, cow mature, good soil, sea grass and fish emulsion. Some of the world's heaviest

pumpkins, including the record bolder, were on public display at the Bronx Botanical Gardens in New

Yost for a dozen days.

1.  Why is Kenichi Ito described ?s a man with a "super power"?

A. He set a good example to all Japanese.

B. He made record attempts in 15 different countries.

C. He set a new record for "Fastest 100 m running on all fours".

D. He participated in the 2008 Guinness World Records Day activities.

2. Jeffries is the name of _____.

A .the owner of the dog with the longest ears

B. the grandfather of the dog with the longest care

C. the present holder of the record for "Longest care on a dog"

D.  the former holder of the record for " longest care on a dog'

3. How many T-shirts had Krunoslav Budiseli put on before he felt it difficult to go on?

A. 68.

B. 120.

C. 238.

D. 245.

4. According to the given information. which Guinness World Record was most recently set?

A. The record for "Most people inside a soup bubble".

B. The record for "Most living generations'".

C. The record for "Most T-shirts worn at once".

D. The record for " Heaviest pumpkin".

题型:选择题

(16分)如图所示,一质量为0.99kg的木块静止在水平轨道ABB端,水平轨道与半径为10m的光滑弧形轨道BC相切。现有一质量为10g的子弹以500m/s的水平速度从左边射入木块且未穿出。已知木块与水平轨道的动摩擦因数μ=0.5,g=10m/s2。求:

(1)子弹射入木块与木块获得的共同速率;

(2)子弹射入后与木块在圆弧轨道上升的最大高度;

(3)从木块返回B点到静止在水平面上,摩擦阻力的冲量的大小。

                         

题型:选择题

促使胰液中各种酶分泌的重要体液因素是()

A.促胃液素

B.促胰液素

C.胆盐

D.HCl

E.缩胆囊素

更多题库