附件是2019年国际计量大会的原文,其中秒的定义如下
“The second, symbol s, is the SI unit of time. It is defined by taking the
fixed numerical value of the cesium frequency ?ν Cs, the unperturbed
ground-state hyperfine transition frequency of the cesium 133 atom, to
be 9 192 631 770 when expressed in the unit Hz, which is equal to s–1.”
请找到你的“海平面”的描述,这脸皮实在是厚,打脸都打不疼的。。。
【 在 wdek 的大作中提到: 】
: 是,你说的对,继续否定海平面,继续,继续,哈哈哈,继续
:
附件(1MB) NIST.SP.330-2019.pdf--
FROM 210.34.16.*