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【单选题】
用集成四位全加器74283和组合逻辑电路设计的代码转换电路如图所示。设电路输入DCBA为8421BCD码，若要电路输出S3S2S1S0的编码为5421BCD码，则74283的加数B3B2B1B0对应的输入为 。【图片】A.
， ， ，
B.
， ， ，
C.
， ，
D.
， ，
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【简答题】在客户关系管理系统中实施的方法论是,系统是分析对象,环境是 。
【单选题】Passage 1 It is commonly believed in the United. States that school is where people go to get an education. Nevertheless, it has been said that today children interrupt their education to go to school...
A.
Education and schooling are quite different experiences.
B.
One can receive education everywhere, or going to school is not a must.
C.
The common belief that people go to school to get an education is wrong.
D.
Schooling offers a limited section of formal training while education covers a vast field of informal training.
【简答题】简述机床夹具的作用？
【简答题】简述机床夹具的作用。
【简答题】在客户关系管理系统中实施的方法论时，系统是分析对象，环境是（ ）。
【单选题】To get an education, _______.
A.
working hard is very important
B.
working hard is needed
C.
it is needed to work hard
D.
one must work hard
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