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

分析仪器样品处理系统使用的稳流阀是一种平衡式（）调节器。

A、流量

B、压力

C、减压

D、增压