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一次近似 yīcì jìnsì
math.	first approximation
oil	first-order approximation
space	approximation of 1st degree
tech.	approximation on the average; initial approximation
一二次近似值
busin.	approximation of 1st degree; approximation of 2nd degree
一次〔第一级〕近似
construct.	first approximation
一次［级］近似
space	first approximation

一 次近似: 7 phrases in 5 subjects

Business	1
Construction	1
Electronics	1
Space	2
Technology	2