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onsite purchasing
现场采购
图书采访人员直接到书店、书市或出版社销售部门选购书刊的方式。简称现购或现采。
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symbol of a binary composition
symbol of a differential equation
symbol of a differential operator
symbol of an elliptic complex
symbol of an equation
symbol of an integral operator
symbol of an operation
symbol of an operator
symbol of a pseudodifferential operator
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symbol of a vector field
Symbol of Chinese cultural heritage
symbol of conjunction
symbol of disjunction
symbol of equivalence
symbol of happy encounters
symbol of joint negation
symbol of logical product
symbol of logical sum
symbol of proportion
symbol of ratio
symbology
symbols and abbreviations on chart
symbol sequence
symbols for electrical diagrams
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