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什么是存储器的内零头和外零头它们是怎么造成的减少它们应采取什么措施
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试述分页存储管理的基本实现原理，并说明如何实现从逻辑空间到物理空间的变换
有一个程序要把100×100的数组置初值“0”，现假定有两个主存块可用来存放数组中的元素，每个主存块可以存放200个数组元素，数组中的元素按行编址。两个主存块的初始状态都为空，若程序编制如下： (1)Var A:array[1..100] of array[1..100] of integer; for j:=1 to 100 do for i=1 to 100 do A[i,j]:=0 (2)Var A:array[1..100] of array[1..100] of integer; for i:=1 to 100 d0 for j:=1 to 100 do A[i,j]:=0 当采用LRU页面调度算法时，对上述两种程序编制方法各会产生多少次缺页中断
What will man be like in the future—in 5,000 or even 50,000 years from now We can only make a guess, of course, but we can be sure that he will be different from what he is today. For man is slowly changing all the time.Let us take an obvious example. Man, even five hundred years ago, was shorter than he is today. Now, on average, men are about three inches taller. Five hundred years is a relatively short period of time, so we may assume that man will continue to grow taller.Again, in the modern world we use our brains a great deal. Even so, we still make use of only about 20% of the brain"s capacity. As time goes on, however, we shall have to use our brains more and more, and eventually we shall need larger ones! This is likely to bring about a physical change too: the head, in particular the forehead, will grow larger.Nowadays our eyes are in constant use. In fact, we use them so much that very often they become weaker and we have to wear glasses. But over very long period of time it is likely that man"s eyes will grow stronger.On the other hand, we tend to make less use of our arms and legs. These, as a result, are likely to grow weaker. At the same time, however, our fingers will grow more sensitive because they are used a great deal in modem life.But what about hair This will probably disappear from the body altogether in course of time because it does not serve a useful purpose any longer. In the future, then, both sexes are likely to be bald!Perhaps all this gives the impression that future man will not be a very attractive creature to look at! This may well be true. All the same, in spite of all these changes, future man will still have a lot in common with us. He will still be a human being, with thoughts and emotions similar to our own. The passage tells us about ______.
黄河公司为上市公司。增值税一般纳税企业，适用增值税税率为17%(假设没有其他税费)，原材料只有甲材料一种并专门用于生产车间生产乙产品，该公司原材料按计划成本法进行日常核算。20×7年11月1日，甲材料的计划单价为80元/千克，计划成本总额为250000元，材料成本差异为16010元(超支)，公司采用月末一次加权平均法计算发出材料成本。(一)11月份，甲材料的收入与发出业务有： (1)3日，收到上月采购的甲材料600千克，实际采购成本为49510元，材料已验收入库。 (2)4日，生产车间为生产乙产品领用甲材料1000千克。 (3)5日，从外地X单位采购甲材料一批共计5000千克，增值税专用发票上注明的材料价款为410000元，增值税为69700元，发生运杂费11300元(不考虑可抵扣税金)。款项及运杂费已通过银行支付，材料尚未收到。 (4)15日，收到本月5日从外地X单位采购的甲材料。验收时实际数量为4780千克，经查明，短缺的200千克系由于供货单位少发货，要求供货方退还多付款项，另20千克系运输途中合理损耗。购入该批材料的运杂费全部由实收材料负担。 (5)16日，生产车间为生产乙产品领用甲材料3250千克。 (6)28日，从外地Y单位购入甲材料1000千克，增值税专用发票上注明的材料价款为78000元，增值税为13260元，材料已验收入库。 (二)生产车间生产乙产品的资料有： (1)乙产品的生产需要经过三道工序，工时定额为50小时，其中第一、第二和第三道工序的工时定额依次为10小时、30小时和10小时，原材料在产品开工时一次投入，各道工序在产品月末的完工程度均为50%，月末采用约当产量法分配生产费用。 (2)11月初，乙在产品成本为82450元，其中直接材料71610元，直接人工和制造费用10840元。 (3)11月共发生直接人工和制造费用172360元。 (4)11月共完工乙产品650件。 (5)11月30日，乙产品的在产品为260件，其中第一、第二、第三道工序的在产品依次为50件、110件和100件。 (三)12月1日，黄河公司以其完工乙产品的50%换入长江公司的一台生产经营用设备，乙产品的计税价格等于公允价值250000元。交换过程中黄河公司支付给长江公司58500元，同时为换入设备支付相关费用500元。设备的原价为300000元，已提折旧20000元，已提减值准备10000元，设备的不含税公允价值为300000元。假定该交易具有商业实质。 根据上述资料，回答下列问题。 黄河公司11月份完工乙产品的总成本为______元。
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