初一 第7章 认识物质

Quiz
•
Physics
•
7th Grade
•
Medium
老师 邱
Used 388+ times
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20 questions
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1.
FILL IN THE BLANK QUESTION
20 sec • 1 pt
物质是由大量______ 构成的。
2.
FILL IN THE BLANK QUESTION
20 sec • 1 pt
分子间有_______ 。
3.
FILL IN THE BLANK QUESTION
20 sec • 1 pt
分子一直处在永不停息地___________中
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
下列关于分子的说法正确的是( )
分子是微观世界中的最小微粒
将一块糖进行若干次对分,但要保持其甜味,可分为的最小微粒是分子
蛋白质是一种大分子,它的大小大约有几十微米
分子很小,所以必须用光学显微镜看
5.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
关于分子动理论的描述,下列说法中错误的是( )
物体是由分子构成的
物体里含有的分子数通常是很多的
温度越高,分子运动越快;0℃时分子运动停止了
分子间引力和斥力是同时存在的
6.
MULTIPLE CHOICE QUESTION
10 sec • 1 pt
下列物质没有一定体积的是( )
冰块
水银
二氧化碳气体
石墨
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
在铺设铁轨时,两跟铁轨的接头处一般要留有空隙,是为了( )
防止铁轨的热胀冷缩
减小铁轨的热胀冷缩
防止铁轨温度降低时,铁轨收缩产生的破坏作用
铁轨温度升高时可以自然膨胀,防止铁轨膨胀产生的破坏作用
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