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m是专著，j是期刊，c是会议论文m，d是学位论文，p是专利，s是标准，db是数据库，ol是指联机网络。 加上J/N的分别是网络上的专著和期刊。 本回答被网友采纳

m-：从存储器内容中减去当前显示值，是计算结果并用已储存的数字减去目前的结果； mr：按下此键将调用存储器内容, MC：按下时清除存储器内容 GT：按下GT键,传送GT存储寄存器内容到显示寄存器;按AC或C键消除GT显示标志.

Google Help provides assistancem and answers to your questions about Google products and services.

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