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离岸价（FO+国外运费+国外运输保险费 离岸价（FO+国外运费+关税 离岸价（FO+增值税+关税 离岸价（FO+国外运费+增值税
American , America America , American American , American America , America
FO价+海运费+保险费+关税 FO价+海运费+保险费+关税+外贸手续费 FO价+海运费+保险费+关税+增值税 FO价+海运费+保险费+关税+外贸手续费+增值税
America, England English, America American, English England, America
was studied has been studied studied was studying
did he meet he met he has met had he met
等于发射频率 为fo－63MHz 为fo＋63MHz 为fo±63MHz中的一个
acquaintance coincidence viewpoint procedure
Fo<0.5； Fo>1； Bi<0.1； Fo<0.25。
China；Chinese English；England American；America Chinese；China
has she Isn’t she hasn’t she does she
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