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【单选题】
下列关于质点的说法中正确的是（）A.
质点是一个理想化的模型，实际上是不存在的，所以引入这个概念没有多大意义
B.
只有体积很小的物体才能看做质点
C.
凡是轻小的物体，皆可看做质点
D.
如果物体的形状和大小对研究的问题属于无关或次要因素时，即可把物体看做质点
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【简答题】请说出图中该产品的生命周期特点?并说明该产品是否为好产品?
【简答题】请说出图中该产品的生命周期特点?并说明该产品是否为好产品?
【单选题】听力原文：W: Did you go see the doctor about your cough? M: The doctor said if I keep smoking it will increase my chance of having a heart attack or lung disease. And I am thinking about quitting smoking a...
A.
He has had a heart attack because of smoking.
B.
He has serious lung disease.
C.
He is coughing because of too much smoking.
D.
He will go to see a doctor about his coughing.
【简答题】( 提交答案时为第 1 题) A)The physics class is very difficult . B)The physics class is not given this tenll . C)The physics class is easier than peoplethink . D)The physics class should be cancelled if possibl...
【单选题】听力原文：W: Did you go to see the doctor about your cough? M: The doctor said if I keep smoking it will increase my chance of having a heart attack or, lung disease. And I am thinking about quitting smoki...
A.
He will go to see a doctor about his coughing.
B.
He has had a heart attack because of smoking.
C.
He is coughing because of too much smoking.
D.
He has a serious lung disease and heart attack already.
【多选题】下列内容属于原始凭证必须具备而记账凭证不具备的是（ ）。
A.
填制原始凭证单位名称或者填制人姓名
B.
所附原始凭证张数
C.
接受凭证单位名称
D.
数量、单价和金额
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