Phân biệt vật chất ở góc độ trừu tượng và góc độ cụ thể. Cho ví dụ chứng minh

In what two ways were the tang and song dynasties of china similar? they jointly built the grand canal. they were economically strong. they had weak military forces. they ruled for about 300 years. they discouraged buddhist ideas.

The primary purpose of a certificate of confidentiality is to: allow law enforcement to investigate abuse cases.protect researchers from disclosing conflicts of interest.prevent subjects from knowing the purpose of a study.protect identifiable research information from compelled disclosure.

Discuss the role of policy analysis in policy modification. include a description of a federal agency that supports policymaking through policy analysis.