在酸性尿冷却后可见到尿酸盐结晶，其颜色是（）。

A.红色

B.淡红色

C.紫红色

D.灰白色

E.乳白色

According to the Customs Law, while the examination is being carried out, ( ) should be present and responsible for moving the goods, opening and restoring the packing.

A．customs officer

B．harbor officer

C．the consignee of the import goods or the consignor of the export goods

D．the owner of the ship