China's national defense from what aspects?

National defense, as survival knowledge, is also national defense, which refers to military and military-related political, diplomatic, economic and cultural construction and struggle to defend national sovereignty and territorial integrity and guard against foreign aggression and subversion. Including armed construction, national defense system, military science and technology and industry, national defense engineering, military transportation and communication, manpower mobilization, national defense education and national defense laws and regulations, it is a huge and complex system. From the supreme head of state to every citizen, from military to politics, economy, culture, education, science and technology and ideology are closely related to it.