甲乙两名溜冰运动员的质量分别为m1=80kg、m2=40kg,两人面对面在光滑水

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问题:

甲乙两名溜冰运动员的质量分别为m1=80kg、m2=40kg,两人面对面在光滑水平冰面上拉着弹簧秤作圆周运动,此时两人相距0.9m,弹簧秤的示数为24N,则下列判断正确的是(  )

A.两人的线速度相同,约为0.5m/s

B.两人的角速度相同,为1rad/s

C.两人的运动半径相同,都是0.45m

D.两人的运动半径不同,甲为0.3m,乙为0.6m

考点:向心力牛顿第二定律
题型:多选题

阅读理解。

Dear David,

     How are you? I'm fine. I'm in London, at the International (国际的) School of English. I'm in Class

3 with eight students. They're from different countries-Spain (西班牙), Japan, Argentina (阿根廷),

Switzerland (瑞士) and Thailand (泰国). Our teacher's name is Henry Briscall. He's very nice. He's a very

good teacher.   

     I'm living with an English family. Mr. and Mrs. Brown have three children. Thomas is fourteen,

Catherine is twelve, and Andrew is seven. They are all very friendly, but it isn't easy to understand

(懂) them!

      London is very big and very interesting. The weather is good, cold but sunny and the parks are

beautiful! Hyde Park, Green Park, and St. James' Park are all in the city centre (市中心).

      English food is OK, but the coffee is horrible (可怕)!

     Write to me soon.

                                                                                                                                        Love, 

                                                                                                                                        Paul

1. The letter is from _____. [ ]

A. David

B. Paul

C. Paula's classmate

D. Not A, B or C

2. The writer's (作者的) class has _____. [ ]

A. many students

B. nine students

C. eight students

D. eight girls

3. The writer lives (住) _____.[ ]

A. at school

B. in a hotel

C. with her classmates

D. at Mr. Brown's home

4. What's the writer's teacher's name? [ ]

A. Henry Briscall.

B. Thomas.

C. Andrew.

D. Catherine.

5. How old is Andrew? [ ]

A. 14.

B. 12.

C. 7.

D. 9.

题型:多选题

读右面“北半球环流模式图”,完成以下3题。

6.在北半球洋流模式图中,标错洋流流向箭头的数码是

A.①   B.②   C.③   D.④

7.关于洋流的叙述,正确的是

A.暖流对沿岸地区气候起降温减湿的作用

B.洋流可以加快污染净化速度,有益无害

C.顺流航行省时省力,逆流航行则相反   D.世界渔场的产生与洋流无关

8.北海道渔场应位于哪两支洋流交汇处  

A.①④    B.②⑥    C.⑤⑥     D.②③

题型:多选题

对有严格防水要求的地下室或地下构筑物外墙有管道穿过的,应采取的防水措施是()。

A.不能采用钢套管

B.可采用塑料套管

C.须采用柔性防水套管

D.必须采用刚性防水套管

题型:多选题

入院查体:肛温35.9℃,呼吸75次/分,心率182次/分,面色发绀,呻吟,口吐泡沫,前囟张力不高,心音低钝,双肺未闻及湿罗音,肝肋下5cm,四肢冷有花纹,肌张力低下,原始反射未引出。考虑合并

A.肺炎

B.呼吸衰竭

C.心力衰竭

D.颅内感染

E.肝脏脓肿

题型:多选题

Ipv6将32位地址空间扩展到:128位()

A、64位

B、128位

C、256位

D、1024位

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