A question

What is the meanning of "security clearance"?

What is the meanning of "No clearance"?

所有跟帖： 

• My question might be -风丽- ♀ (72 bytes) () 04/09/2010 postreply 06:52:25

• If you don't know what it is, you probably don't have it. -屋漏痕- ♂ (49 bytes) () 04/09/2010 postreply 07:10:51

• thanks a lot -风丽- ♀ (0 bytes) () 04/09/2010 postreply 07:30:03

• 你若不是美国公民就都沾不上边。 -sigma- ♂ (106 bytes) () 04/09/2010 postreply 07:14:15

• thanks a lot -风丽- ♀ (0 bytes) () 04/09/2010 postreply 07:29:49

• 预防白领犯罪的东东吧。有这本本的比没有的工资会高出不少 -1800866- ♀ (0 bytes) () 04/09/2010 postreply 07:22:02

• thanks a lot.:) -风丽- ♀ (0 bytes) () 04/09/2010 postreply 07:29:35