US，USA和America有什么区别？_百度知道
US，USA和America有什么区别？1、地理概念不同：我们最常用的就是America，这个词原本指“美洲”，因为美国的崛起，现在大部分情况下指“美国”，相比USA或者是US，America更侧重 …
U.S.、USA、America 有什么区别？ - 知乎
Oct 15, 2014 · USA/US是美国的国家代码（没有表示缩略的“.”），在国际上有多套国家代码标准，它们之间会有一些微小差异，通常ISO-3166标准使用比较普遍。
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1S等于多少ms (毫秒)1ms等于多少us (微秒) - 百度知道
1s=1000ms,1ms=1000us 1秒=1000毫秒 (ms),1毫秒=1／1000秒 (s)； 1秒=1000000 微秒 (μs),1微秒=1／1000000秒 (s)； 1秒=1000000000 纳秒 (ns),1纳秒=1／1000000000秒 (s)； 1 …
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