国家实行重要农产品保障战略，地域明确保障目标，构建科学合理、案例高效的重要农产品供给保障体系。（）

单项选择题Every business is managed through what three major functions? （ ）.

单项选择题The letter of credit may specify which institute to issue a certificate of origin (C O). If the institute is not specified in the letter of credit, usually the Chinese exporter should choose China Customs to issue a C O. But banks should accept C O issued by both CCPIT and China Customs. A、正确 B、错误