telescope objectives lenses
望远镜对物镜

• Ge
• gear
• gear bank
• gear box
• gear coupling
• gear drive
• gearing
• gear lead checking machine
• gear lever
• gear mesh
• gear rack
• gear sector
• gear shift
• gear sprial
• gear testing machine
• gear thickness gauge
• gear tooth venier caliper
• gear-type coupling
• gear wheel
• gear wheel shaft
• gear wheel tester
• gegenschein-zodiacal light photometer
• Geiger counter
• Geiger-mueller counter
• Geiger Mueller region