- A highly evacuated electron tube containing an anode, a cathode, and a control grid.三极管：带有阳极、阴极和控制栅极的高真空的电子管
- Johnston Community College
- Johnstown
- John the Baptist
- John Tyler Community College
- John Wesley College
- John Wood Community College
- John XXIII
- Johor Baharu
- joie de vivre
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- Joint Chiefs of Staff