单项选择题
A.purity;thickness;stain B.stain;purity;thickness C.purity;stain;thickness D.thickness;stain;purity
A.case B.currency C.container D.catalogue
A.途径口岸;签证地点;产地 B.产地;签证地点;途径口岸 C.签证地点;产地;途径口岸 D.产地;途径口岸;签证地点