Such a method is commonly used in desk calculating machines and bicycle cyclometers . 這種方法在臺式計算機和自行車?yán)锍瘫碇惺峭ㄓ玫摹?i class="labawb" onClick="playMp3('sound_c_1')">
10 - key keyboard for adding and calculating machines 加法器和計算機的10鍵鍵盤
He can make calculations even faster than a calculating machine 他運算得經(jīng)計算器還快。
Adding machines and calculating machines - numeric section of ten - key keyboards 加法器和計算器十鍵鍵盤的數(shù)字區(qū)
Adding machines and calculating machines - keytop and printed or displayed symbols 加法器和計算器鍵頂打印或顯示符號