ns
abbr. 毫微秒(nanosecond);未规定(not specified)
nanosecond毫微秒(时间单位等于1秒的10亿分之一)
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abbr. 毫微秒(nanosecond);未规定(not specified)
nanosecond毫微秒(时间单位等于1秒的10亿分之一)
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