Pay attention to the development of national defense science and technology-ordnance science and technology, international outlook, modern military, international aviation
Pay attention to military equipment-weapons knowledge, aviation knowledge, weapons, modern weapons and light weapons.
Military system concerned with the history of war-military history and military history.
Pay attention to naval equipment-ship knowledge
Pay attention to naval equipment and strategy-modern ships
Pay attention to the international shipbuilding trend-international ships
Paying attention to civilian military writers —— A study of the history of war and assault. I recommend Jane from England.
several causes
1. Older
2. The information source is authoritative.
3. A wide range of customers