In this paper two methods to elevate the return factor of the d.

串联电阻法与双线圈换接法是两种提高直流电磁开关返回系数的常用方法。

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Climate change is a big driving factor behind his warning and, in Fenner's opinion, we've passed the point of no return.

芬纳警告说气候变化是一个很大的拉动因素，他认为我们已经踏上不归路。

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But thousands of people will continue to lose their jobs, and the elusive "feel-good factor" eagerly sought by politicians may take much longer to return.

但是，成千上万的人将会继续失去工作，而政客们急切寻求的那种难以捉摸的“感觉良好因素”或许需要更长的时间才能重返英国。

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This round-up of Monday's main media stories focuses on the return of X Factor.

BBC: The return of the X Factor

The ascendance of the South's economy was a key factor behind the return migration, Frey said.

CNN: Family roots lure many African-Americans back to South

Factor in the return to job cuts and stressed disposable income, and prospects for holiday spending this year are questionable.

FORBES: October Employment Report Puts Restaurant Stocks on Notice