安裝中文字典英文字典辭典工具!
安裝中文字典英文字典辭典工具!
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- National Institute of Standards and Technology | NIST
The National Institute of Standards and Technology - Time and Frequency Division maintains the standard for frequency and time interval for the United States, provides official time to the United States, and carries out a broad program of research and service activities in time and frequency metrology
- NIST Time Widget
NIST Time Widget This widget is a public service provided by the Time and Frequency Division of the National Institute of Standards and Technology (NIST) It is a web clock showing the official time of day from NIST, displayed as a 12 or 24-hour clock, in a user-selectable time zone
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