boat of refractory metal
高熔点金属舟(真空镀膜用)

• protective glass plate
• protective goggles
• protective head-cover
• protective inorganic coating
• protective layer
• protective metal shell
• protective paint
• protective shield
• protector
• protect tubes for fiber optic fiber
• proton
• proton bombardment
• proton microscope
• proton-recoil telescope
• prototype
• protractor
• protractor head
• protractor screen
• proustite
• proustite crystal
• proxial scanning system
• proxicon
• proximate calculation
• proximity
• proximity effect