synchronizing frequency
(传真)同步频率

• 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
• mark photo sensors
• mark scraper
• marresisttance
• martensite
• Martens photometer
• martens wedge
• martin's diameter
• marx effect
• Marx generator