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1、1 The origin of the term spam for unsolicited commercial email was recounted inComputerworld, April 5, 1999, p. 70: It a。

2、Congressional Research Service The Library of CongressReport for CongressReceived through the CRS WebOrder Code RL31278A。

3、1 For a discussion of labor certification and attestations for temporary foreign workers, see CRSReport RL30498, Immigra。

4、Congressional Research Service The Library of CongressCRS Issue Brief for CongressReceived through the CRS WebOrder Code。