cesium fountain clock造句

例句与造句

1. This is one reason why NIST-F1, a cesium fountain clock, can keep time more precisely than NIST-7, a cesium beam clock.
2. "' NIST-F1 "'is a cesium fountain clock, a type of atomic clock, in the National Institute of Standards and Technology ( NIST ) in Boulder, Colorado, and serves as the United States'primary time and frequency standard.
3. To have a time basis for this, PTB operates several atomic clocks ( currently two cesium clocks and, since 1999 and 2009, respectively, two cesium fountain clocks . ) By order of PTB, the synchronization of clocks via radio is performed via the time signal transmitter DCF77 operated by Media Broadcast.
4. It's difficult to find cesium fountain clock in a sentence. 用cesium fountain clock造句挺难的