automatic sampling
(1)自动取样
(2)自动进样

• night window
• nigh-vison googles
• nigrescent
• nil
• niobate
• niobium
• niobium-base superconductiing material
• Nipkow disk
• nippers
• nipple
• nit
• nitralloy
• nitrate
• nitrate film
• nitric
• nitric acid
• nitric oxide
• nitride
• nitrile
• nitrite
• nitrobenzene
• nitrocellulose
• nitrocellulose film
• shape-V thread
• shaping