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简述文件系统的结构。

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位示图可以用来指示磁盘存储空间的使用情况，一个磁盘组的分块确定后，根据可分配的总块数决定位示图由多少个字组成，位示图中的每一位与一块对应，“1”状态表示相应块已，“0”状态表示该块。

Trees are useful to man in three important ways: they provide wood and other products; they give him shade; and they help to prevent droughts and floods. Unfortunately, in many parts of the world, man has not realized that the third of these services is the most important. In his eagerness to make money from trees, he has cut them down in large numbers, only to find that without them he has lost the best friends he had. And besides, he is usually too careless to plant and look after new trees. So the forests slowly disappear. This does not only mean that man will have fewer trees. The results are even more serious: for where there are trees, their roots break up soi — allowing the rain to sink in — and also bind the soil, thus preventing it from being washed away easily; but where there are no trees, the rain falls on hard ground and flows away, causing floods and carrying away the rich top-soil. When all the top-soil is gone, nothing remains but worthless desert. The origin of floods and starvation in some countries is ______.

A. too much rain washed away the soil
B. forests took up too much land
C. roots of the trees break up the soil
D. there are no longer trees to keep the rain and protect the top-soil

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P公司为一上市公司，1999年12月20日发现1990年12月开始使用的一项固定资产仍然挂在“在建工程”科目中。该项固定资产原价50000元，预计使用年限10年（与税法规定一致），采用直线法计提折旧（不考虑残值）。设该公司适用的所得税税率为33%，该项会计差错的调整对留存收益的影响金额为（）。

A. 15000元
B. 10050元
C. 20000元
D. 33500元

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Trees are useful to man in three important ways: they provide wood and other products; they give him shade; and they help to prevent droughts and floods. Unfortunately, in many parts of the world, man has not realized that the third of these services is the most important. In his eagerness to make money from trees, he has cut them down in large numbers, only to find that without them he has lost the best friends he had. And besides, he is usually too careless to plant and look after new trees. So the forests slowly disappear. This does not only mean that man will have fewer trees. The results are even more serious: for where there are trees, their roots break up soi — allowing the rain to sink in — and also bind the soil, thus preventing it from being washed away easily; but where there are no trees, the rain falls on hard ground and flows away, causing floods and carrying away the rich top-soil. When all the top-soil is gone, nothing remains but worthless desert. Which statement is true about the disappearance of forests

A. Man should look after the new trees properly.
B. Man has not paid enough attention to planting trees.
C. Man can’t cut too much wood.
D. All of the above.

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简述文件系统的结构。

位示图可以用来指示磁盘存储空间的使用情况，一个磁盘组的分块确定后，根据可分配的总块数决定位示图由多少个字组成，位示图中的每一位与一块对应，“1”状态表示相应块已______，“0”状态表示该块______。

位示图可以用来指示磁盘存储空间的使用情况，一个磁盘组的分块确定后，根据可分配的总块数决定位示图由多少个字组成，位示图中的每一位与一块对应，“1”状态表示相应块已，“0”状态表示该块。