Fluorescent lights, which consist of tubes filled with mercury vapour, are roughly four times more efficient.
灯管中充上水银蒸汽的荧光灯比它的功效高大约四倍。
2
Mercuryfilled and mercury wetted relays are exceptions to this general rule.
水银填充和水银湿簧继电器是例外情况。
3
An instrument used to measure pressure. A manometer consists of a U-shaped tube partially filled with a liquid that can vary in specific gravity from 1.0 (water) to 13.57 (mercury).