Article 156. The Content and Application of the Customs Procedure of Free Customs Zone, the Terms for Placement of Goods under the Customs Procedure of Free Customs Zone and the Use Thereof in Accordance with Such Customs Procedure, the Completion of the Customs Procedure of Free Customs Zone, the Appearance and Termination of the Duty to Pay Import Customs Duties, Taxes, Safeguard, Anti-Dumping and Countervailing Duties