| 单词 | vacuum tubes |
| 释义 | vacuum /vakˈū-əm, -ūm or -yŭm/noun (pl vacˈūums or (not of the cleaner) vacˈua /-ū-ə/)
To clean with a vacuum cleaner adjective
ORIGIN: L, neuter of vacuus empty vacˈūist noun A person who thinks there are empty spaces in nature vacuum brake noun A brake in the working of which suction by vacuum(s) supplements the pressure applied by the operator, esp a braking system of this type applied simultaneously throughout a train vacˈūum-clean transitive verb and intransitive verb vacuum cleaner noun An apparatus for removing dust by suction vacuum cleaning noun vacuum concrete noun Concrete enclosed in special shuttering which enables suction to be applied to remove excess water vacuum flask noun An insulated flask for keeping substances hot or cold by means of a vacuum lining vacuum forming noun A method or process of shaping thermoplastic by applying suction to it when warmed and placed over a mould vacuum gauge noun A gauge used to measure pressures lower than atmospheric pressure vacˈuum-packed adjective Sealed in a container from which most of the air has been removed vacuum printing frame noun A frame from which air can be exhausted to ensure close contact between the film image and plate vacuum pump noun A general term for apparatus which displaces gas against a pressure vacuum tube noun A sealed glass tube in which a vacuum has been made, eg a thermionic valve ultra-high vacuum A very close approach to complete vacuum, important for certain work of scientists and technologists |
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