一个发光点,沿凸透镜的主轴从远处向凸透镜二倍焦距处移动,移动的速度为V,则发光点

题型:选择题

问题:

一个发光点,沿凸透镜的主轴从远处向凸透镜二倍焦距处移动,移动的速度为V,则发光点的像的速度(  )

A.大于V

B.小于V

C.等于V

D.都有可能

考点:凸透镜对光的作用
题型:选择题

Many students get ill easily .They have to go to hospital and may miss a lot of classes. What can we do to keep healthy? Here are some tips:

Healthy food. You should eat less fast food but more vegetables and fruit. You’d better drink 500 ml milk every day .Remember to eat breakfast.

Enough exercise. Doing exercise is important. It makes you more athletic .You can play some sports after class or on weekends.

Happy smiles. Smile is a good way to make you healthy .Try to find things that can make you laugh .Remember that smile is the best medicine to cure(治疗)your illness.

Good rest. If you want to get a good grade ,you must have a good rest .As a famous saying goes, “Early to bed and early to rise makes a man healthy ,wealthy(富有的)and wise(聪明的).

小题1:将划线句子翻译成汉语。_______________________________________.

小题2:完成下列句子,每空词数不限。

If you get ill, you have to __________________________and may __________________.

小题3:完成下列句子,每空词数不限。

You can play sports_________________ or___________

题型:选择题

下列可出现继发性毛细血管扩张的是()。

A.血管瘤

B.酒渣鼻鼻部毛细血管扩张

C.蜘蛛状毛细血管扩张

D.匍行性血管瘤

E.血管性母斑

题型:选择题

一切商品对于商品生产者而言,最重要的是商品的()

A.价值

B.使用价值

C.剩余价值

D.超额剩余价值

题型:选择题

常可导致肛瘘的肛门部位手术是()

A.内痔注射疗法

B.肛裂切除术

C.血栓性外痔切开取栓术

D.肛周脓肿切开(或穿破)

E.内痔环切术

题型:选择题

证券公司办理集合资产管理业务,应当保证( )相互独立,单独设置账户、独立核算、分账管理。

A.集合资产管理计划资产与其自有资产

B.集合资产管理计划资产与其他客户的资产

C.不同集合资产管理计划的资产

D.集合资产管理计划内各项资产

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