It doesn t vary five minutes in the year , it s a perfect chronometer , look you 它一年也差不了四五分鐘,這是個標準表。 ”
Chronometer ; wrist chronometer with piezo - electric oscillating system , designation , requirements , testing 精密記時計.第2部分:帶有壓電振蕩系統(tǒng)的手表式精確記
Ancient chinese astronomy exhibition - an extravaganza of masterly astronomical instruments and chronometers 中國古天文成就展匠心獨運的天文儀器及時計大匯展
Chronometer ; wrist - chronometer with frequency of oscillating system 1000 hz , designation , requirements , testing 精密記時計.第1部分:帶有振蕩系統(tǒng)頻率1000hz的手