§ 151.Preparation and sale of worthless or harmful products for domestic animals prohibited; 预应力混凝土施工法 § 152.Importation regulated and prohibited § 153.Inspection of imports; 入口和检测 § 154.Regulations for preparation and sale; 许可证,许可证 § 154a。 special circumstances;expedited procedure;conditions;exemptions;criteria § 155.Permits for importation § 156.Licenses conditioned on permitting inspection; 支撑,支撑 § 157.检验 § 158.Offenses; punishment § 159.Enforcement; 可焊;Congressional findings