清河区某小学四年级(2)班正在举行讲故事比赛,小王同学讲了一个故事,内容如下:小

题型:选择题

问题:

清河区某小学四年级(2)班正在举行讲故事比赛,小王同学讲了一个故事,内容如下:小王同学讲的历史故事是

[ ]

A.巨鹿之战

B.赤壁之战

C.淝水之战

D.官渡之战

考点:官渡之战
题型:选择题

Mr. Black,

We're very gladly to have received your money and some reading materials. Thank you very much. We had been studying hard since we came back to school. Under the help of our teachers and classmates, we have made great progresses in our studies. So we often praised and encouraged by our teachers and parents. We have made up our minds to study hard than before to learn every subject good in order to be admitted to key universities in the future.We're looking forward to see you, but we have no chance to go to the Hangzhou ourselves. So we hope you can post us a photo of yours soon.

Best wishes,

Yours,

题型:选择题

Rh血型基因位于()

A.1号染色体

B.3号染色体

C.6号染色体

D.9号染色体

E.12号染色体

题型:选择题

学生在运动会之前在老师的指导下进行队列训练,这种队列训练的行为属于一种()

A.无意模仿

B.有意模仿

C.强迫模仿

D.自愿模仿

E.随意模仿

题型:选择题

实用新型的保护期为()。

A.5年 

B.10年 

C.15年 

D.20年

题型:选择题

如图所示,一小球质量为m,用长为L的悬线固定在O点,在悬点O的正下方L/2处有一颗钉子D。现将悬线拉直后,使小球从A点静止释放,当悬线碰到钉子后的瞬间,下列说法错误的是:[ ]

A.小球的线速度没有变化

B.小球的角速度突然增大到原来的2倍

C.小球的向心加速度突然增大到原来的2倍

D.悬线对小球的拉力突然增大到原来的2倍

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