如图所示,是一弹簧振子,设向右方向为正,O为平衡位置,则振子从a→O运动时,下列

题型:选择题

问题:

如图所示,是一弹簧振子,设向右方向为正,O为平衡位置,则振子从a→O运动时,下列说法正确的是(   )

A.位移为正值,速度为正值

B.位移为正值,加速度为负值

C.位移为负值,速度为正值

D.位移为负值,加速度为负值

考点:弹簧振子
题型:选择题
选词填空
limit ... to              in no time          used to             reach the speed of 
divide ... into           nothing like         nothing but         at no time    
have a word with         be used to         have words with      get down to   
小题1:If I had had the chance to ___________ you, there wouldn’t have been such a terrible misunderstanding.
小题2:I think age is _________ a number and it shouldn’t stop you doing anything that is good for society.
小题3:_________ is anyone allowed to eat or sleep in my class and you are no exception(例外).
小题4:You are completely a liar. Another man who saw the accident told me the whole thing that was _________what you had described.
小题5:It seems that we have ___________ living with the modern inventions, such as mobile phones, and can hardly live without them.
小题6:Stop chatting and it’s time for us to __________ business now.
小题7:In order not to become an Internet addict, you must make sure the time spent online _________ less than one hour a day.
小题8:Opinions on this matter __________ two kinds. Some are for it, while others are strongly against it.
小题9:When asked about what had happened, the boy dare not admit __________ his classmate, for he was afraid of being punished.
小题10:___________416.6 km per hour, a new high-speed train linking Shanghai and Hangzhou set a fresh world record of train speed during its trial operation. 
题型:选择题

将下面长句改写为三个短句子,可增删个别字词。

         韩国首都的中文名称“汉城”为适应许多国民因经济的飞速发展而产生的欲摆脱汉文化影响寻找属于自己文明的心态和历史观念改为了“首尔”。

________________________________________________________

题型:选择题

(10无锡26)在“氦气、食盐、硬铝、氢氧化钠、碳酸氢钠、复尔马林”中选择适当的物质填空:

(1)可用于制造飞机、轮船的是              ;(2)可用于制作动物标本的是           

(3)焙制糕点的发酵粉的主要成分之一是           

(4)               的俗名叫苛性钠

(5)焊接金属时用作保护气的是                   

(6)海水中含量最高的盐是             

题型:选择题

公布示文采用悬挂方式时,多贴于()。

A.铁板上

B.布帛上

C.木牌上

D.厚纸板上

题型:选择题

下列关于公文功能的说法中错误的是( )。

A.公文是行政机关之间纵横向联系的手段

B.公文具有较强的政策性和理论性

C.公文是社会活动的真实记录

D.公文用于规范人们的行为,具有强制约束力

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