畅畅要到清源山游玩，下列哪种天气最适合[ ] A、 B、 C、 D、

（10分）如图（a）所示，一物体以一定的速度v₀沿足够长斜面向上运动，此物体在斜面上的最大位移与斜面倾角的关系由图（b）中的曲线给出。设各种条件下，物体运动过程中的摩擦系数不变。g=10m/s²试求

（1）物体的初速度大小； 

（2）物体与斜面之间的动摩擦因数； 

（3）当θ为30°时最大位移。

何谓AHI（）。

A.呼吸暂停次数

B.低通气次数

C.A+B

D.C÷睡眠时间

E.D×60

西方国家每年举行盛大活动以纪念“哥伦布日”。而委内瑞拉总统查韦斯呼吁拉丁美洲人不要庆祝这个节日，称哥伦布1492年的地理大发现带给拉美土著印第安人的是长达150年的“种族屠杀”，哥伦布是人类历史上最大的侵略与种族灭绝的先锋。对此理解不正确的是(　　)。

A．殖民活动给美洲带来灾难

B．加强了世界联系

C．扩展了工业文明

D．冲击了美洲的传统社会

阅读理解。

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

     Some vacation is just around the corner. One of the best things you can possibly do is to start you own

club. It's great fun especially if you are the sort of person who feels there's never anything to do during the

school holidays.

     The first thing you need to come up with is an idea for your club.   1   Pets, clothes, pop music or dancing

groups, sports, making things? The list is endless.

     Next you need some friends to be in your club with you.   2   All you need is three or four other people

who are interested in the same thing as you.

        3  You should all sit down somewhere together with lots of pieces of paper and write down every name

you can think up. That'll keep you busy for ages.

     At your first meeting you should make up a rule book. And the first rule should be no grown-ups or

little/big brothers or sisters! The best clubs are always secret!

     Now you have just about everything you need, except membership cards. These are very important and

again you can spend a lot of time making them.   4  Why not leave some space for a photo of yourself? That

will make the membership card really look like it.

     So there you are, get clubbing! Once you get started you'll think of loads of more interesting things to do!

A. That's easy.

B. Enjoy your own club!

C. Invite a designer to join you.

D. What are you interest in?

E. Then you need to pick a name for your club.

F. Use a bright thick pen to make a special design.

划分非电离辐射与电离辐射的电磁辐射量子能量水平是（）

A.2eV

B.12eV

C.20eV

D.12库仑

E.12Ci