电灯泡外壳用玻璃制成，把灯丝保持在真空，或低压的惰性气体之下，作用是防止灯丝在高温之下氧化。
Glass shell made of a light bulb to keep the filament in a vacuum, or inert gas under low pressure, role is to prevent oxidation of the filament at high temperature under.
电灯泡外壳用玻璃制成，把灯丝保持在真空，或低压的惰性气体之下，作用是防止灯丝在高温之下氧化。
Glass shell made of a light bulb to keep the filament in a vacuum, or inert gas under low pressure, role is to prevent oxidation of the filament at high temperature under.
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