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shi jian ji liang gu jin
Author(s): 
Pages: 22
Year: Issue:  2
Journal: Applied Technology of Technical Supervision

Keyword:  时间计量“表”准确度地球自转时间频率基准时间计量仪器稳定度机械钟表古代计时仪器《辞海》;
Abstract: 时间计量古今席阳据《辞海》注:“时,为计时单位。为时辰、一昼夜分为12个时辰,如子时、午时等。每一时辰合现在的两个小时。据文献记载:‘自汉以下,历法斯密,于是一日分为12时,盖不知始于何人,而至今遵用不废……,,“时间,指时间计量,包括时间间隔和时刻...
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