cylindrical rooler bearing
筒形滚柱轴承

• hub
• hubble
• hubner rhomb
• hue
• hue angle
• hue control
• huefner spectrophotometer
• hue shift
• huge
• hum
• human exposrue
• human eye
• human eye accommodation system
• human eye sensory detection system
• human vision
• humidifier
• humidity
• humoru
• hump
• hump resonance
• hundredweight
• hunting
• hunting glass
• hunting telescope
• Hurter-Driffield curve