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MCS-51系列单片机共有四个并行I/O口,分别是Po、P1 P2和P3。其中P口一般作地址线的低八位和数据线使用;P2口 作地址线的高八位使用;P3是一个双功能口,其第二功能是一 些很重要的控制信号,所以P3一般使用其第二功能。这样供用 户使用的IO口就只剩下P口了。另外,这些口没有状态寄 存和命令寄存的功能,因此难以满足复杂的IO操作要求
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Chapter I Entry 第一条外国人入境,应当向中国的外交代表机关、领事机关或者外交部授权的其他驻外机关 申请办理签证。 Article I For entry to China, aliens shall apply for visas to Chinese diplomatic missions, consular posts or other foreign-based agencies authorized by the Foreign Affairs of the People's Republic of China
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1.证明以下各式 (1). AUB=(AB). (2).,-UB, =UN(A,-B,) i=l j= i=l j= (3).An(, )=U(,)
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Interest-Rate Differentials Country risk&ex -rate- expectations Country risk Political upheaval default on loan repayments higher i-rate to compensate Ex-rate expectations expect RMB to appreciate loans in RMB can pay a lower i-rate
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第一部分 日常用语: Daily English I:问候、介绍、告别( Greetings、 introductions and farewells) 1、i' 'm fitterelectrician、per).钳工、电工、管子工 2、 He is an inspector(QC).检验员
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int Search Sq( SSTable ST, int key)∥在有序表上顺序查找的算法,监视哨设在高下 标端 STelem[ST length+1]. key=key for(i=1; ST elem[].key>key i++) if(>ST length.elem[]. key
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The primary concern of chilled food manufacturers is to produce a product that is both wholesome, i.e. it has all the fresh, quality attributes associated with a chilled food, and safe, i.e. free from pathogenic microorganisms and chemical and foreign body contamination. This is particularly important in this product ector as, due to the nature and method of production, many chilled foods are classified as high-risk products
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14.1C++流的概念 14.2格式化I/O 14.3检测流操作的错误 14.4文件流 14.5字符串流
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PART I THE SITUATION AND RECENT DI NTS IN THE FOREST SECTOR Recent developments his chapter discusses some of the main issues effectiveness of forest management(see and emerging trends in the forest sector, Management, conservation and sustainable focusing largely on the last two to three years. development of forest resources, p. 6). A pilot As it is impossible to cover all nev assessment of the health of the worlds developments, notable events and significant
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Part I Listening comprehension(20) Directions: This part is to test your listening ability. There are two sections here Section A Directions: This section is to test your ability to understand short conversations. There are 10-recorded conversation on it. After each conversation, there is a recorded question. The conversations and dialogues will be spoken only once. When you hear a question
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