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【单选题】
关于声音,下列说法正确的是 ( ) 。
A.
我们听到声音就一定有振动
B.
有振动就一定能够听到声音
C.
声音越大传播速度越快
D.
真空也能够传播声音
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参考答案：
举一反三
【单选题】_____ my surprise, when the students saw this film. they all shouted _____ surprise.
A.
In; in
B.
In; at
C.
To; in
D.
To; at
查看完整题目与答案
【简答题】When the students saw their teacher , they suddenly stopped ______ { talk } with each other.
查看完整题目与答案
【单选题】the students saw the worker_________ thick clothes to keep themselves _______ in the shop.
A.
wearing, safe
B.
wear, safely
C.
was wearing, safe
D.
to wear, safely
查看完整题目与答案
【单选题】I saw the students ___ on the chairs in the classroom.
A.
seating
B.
seated
C.
seat
D.
to be seating
查看完整题目与答案
【简答题】电路如图所示,晶体管导通时 U BE =0.7V, β =50, U CES =0.1V。 试分析 U I 为0V、1V、3V三种情况下三极管的工作状态,及输出电压 u o =?
查看完整题目与答案
【单选题】All the students and their class teacher ______ interested in the film they saw yesterday evening. [     ]
A.
is
B.
will be
C.
was
D.
were
查看完整题目与答案
【简答题】材料:我们党作为,面临的最大威胁就是腐败。党的以来,我们党坚持“老虎”、“苍蝇”一起打,使不敢腐的震慑作用得到发挥,不能腐、不想腐的效应初步显现,反腐败斗争压倒性态势正在形成。反腐倡廉、拒腐防变必须警钟长鸣。各级领导干部要牢固树立正确权力观,保持高尚精神追求,敬畏人民、敬畏组织、敬畏法纪,做到公正用权、依法用权、为民用权、廉洁用权,永葆人拒腐蚀、永不沾的政治本色。我们要以顽强的意...
查看完整题目与答案
【单选题】Read the following paragraph from the section "Surprising Pictures From Students." Stephanie Schuttler is one of the scientists. She was worried. She thought the pictures would be of cats and dogs. Sh...
A.
when the students decided to set up cameras
B.
the number of cats and dogs that were near schools
C.
the types of schools that helped with the project
D.
what Stephanie Schuttler thought of the project
查看完整题目与答案
【简答题】请阅读下面的有关科技报道,并回答题后问题。 科学家培养出“器官种子” 皮肤烧伤了,在烧伤部位注射一些皮肤干细胞,烧伤的皮肤即进行自我修复,不留任何疤痕。......将人的胚胎干细胞定向诱导成各种组织干细胞,临床上用来治病,这已不算是遥不可及的梦想。 2001年7月,某科研小组利用试管婴儿父母捐赠的受精卵,开始了人的胚胎干细胞建系。他们把受精卵放在培养液中,七天后,部分受精卵发育成囊胚。去除囊胚透明...
查看完整题目与答案
【简答题】电路如图所示,晶体管导通时 U BE =0.7V, β =50, U CES =0.3V。 试分析 U I 为0V、1V、3V三种情况下三极管的工作状态,及输出电压 u o =?
查看完整题目与答案
相关题目：
【单选题】_____ my surprise, when the students saw this film. they all shouted _____ surprise.
A.
In; in
B.
In; at
C.
To; in
D.
To; at
查看完整题目与答案
【简答题】When the students saw their teacher , they suddenly stopped ______ { talk } with each other.
查看完整题目与答案
【单选题】the students saw the worker_________ thick clothes to keep themselves _______ in the shop.
A.
wearing, safe
B.
wear, safely
C.
was wearing, safe
D.
to wear, safely
查看完整题目与答案
【单选题】I saw the students ___ on the chairs in the classroom.
A.
seating
B.
seated
C.
seat
D.
to be seating
查看完整题目与答案
【简答题】电路如图所示,晶体管导通时 U BE =0.7V, β =50, U CES =0.1V。 试分析 U I 为0V、1V、3V三种情况下三极管的工作状态,及输出电压 u o =?
查看完整题目与答案
【单选题】All the students and their class teacher ______ interested in the film they saw yesterday evening. [     ]
A.
is
B.
will be
C.
was
D.
were
查看完整题目与答案
【简答题】材料:我们党作为,面临的最大威胁就是腐败。党的以来,我们党坚持“老虎”、“苍蝇”一起打,使不敢腐的震慑作用得到发挥,不能腐、不想腐的效应初步显现,反腐败斗争压倒性态势正在形成。反腐倡廉、拒腐防变必须警钟长鸣。各级领导干部要牢固树立正确权力观,保持高尚精神追求,敬畏人民、敬畏组织、敬畏法纪,做到公正用权、依法用权、为民用权、廉洁用权,永葆人拒腐蚀、永不沾的政治本色。我们要以顽强的意...
查看完整题目与答案
【单选题】Read the following paragraph from the section "Surprising Pictures From Students." Stephanie Schuttler is one of the scientists. She was worried. She thought the pictures would be of cats and dogs. Sh...
A.
when the students decided to set up cameras
B.
the number of cats and dogs that were near schools
C.
the types of schools that helped with the project
D.
what Stephanie Schuttler thought of the project
查看完整题目与答案
【简答题】请阅读下面的有关科技报道,并回答题后问题。 科学家培养出“器官种子” 皮肤烧伤了,在烧伤部位注射一些皮肤干细胞,烧伤的皮肤即进行自我修复,不留任何疤痕。......将人的胚胎干细胞定向诱导成各种组织干细胞,临床上用来治病,这已不算是遥不可及的梦想。 2001年7月,某科研小组利用试管婴儿父母捐赠的受精卵,开始了人的胚胎干细胞建系。他们把受精卵放在培养液中,七天后,部分受精卵发育成囊胚。去除囊胚透明...
查看完整题目与答案
【简答题】电路如图所示,晶体管导通时 U BE =0.7V, β =50, U CES =0.3V。 试分析 U I 为0V、1V、3V三种情况下三极管的工作状态,及输出电压 u o =?
查看完整题目与答案
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