Coude focus
(1)科得焦距
(2)科得焦点
(3)科得聚焦

• mapping IR-system
• marble
• marcroentgenogram
• margin
• marginal absorption
• marginal definition
• marginal error
• marginal focus
• marginal ray
• marginal rays
• marginal sharpness
• marginal value
• marginal zone
• margin mirror
• marhic method
• mariine surveying
• marine background
• maritime
• marked power
• marker
• marker register
• marking gage
• marking-off
• marking out
• marking press