[上海科技英汉双解数学词典]·俞竹君译·上海科技社版

【上海科技英汉双解数学词典】俞竹君译上海科学技术.pdf上海科技 英汉双解数学词典 俞竹君译 刘俊杰abacus ancient calculating device madeOf a frame of paralll wires on whichbeadsarestrung The wires define place value(for example,in the decimalnumber sys-tem eachsuccessive wire,countingfromright toleft,would standfor u-nits,tens,hundreds,thousands,and sOn)and beads are slid to the topofeachwacceleration3 travelling in a straight line accelerates at, for cxample,5 m s,its ve- locitymay be saidtobeinereasingby 5m severy second.The acceler ationofacarisusuallyjudgedbythetinrrakenbythecartoreach60 mph from zero.Thefewer the seconds thegreater the acceleration.
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