问题
问答题 简答题
什么是访问控制矩阵？
答案
参考答案：
访问控制矩阵是用矩阵的形式描述系统的访问控制的模型，它由三元组（S，O，A.来定义，其中：
S是主体的集合——行标对应主体
O是客体的集合——列标对应客体
A是访问矩阵，矩阵元素A[s，o]是主体s在o上实施的操作客体以及在其上实施的操作类型取决应用系统本身的特点。
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什么是访问控制矩阵？
参考答案：
访问控制矩阵是用矩阵的形式描述系统的访问控制的模型，它由三元组（S，O，A.来定义，其中：
S是主体的集合——行标对应主体
O是客体的集合——列标对应客体
A是访问矩阵，矩阵元素A[s，o]是主体s在o上实施的操作客体以及在其上实施的操作类型取决应用系统本身的特点。
Jeff Keith has only one leg. When he was only twelve years old, Jeff had cancer. Doctors had to 16 off most of his right leg. 17 Jeff puts on an artificial leg(假肢). The leg is plastic. With the plastic leg, Jeff can ski, ride a bicycle, swim, and play soccer. He can also run. Jeff made a plan with his friends who had plastic legs, 18 . They decided to 19 across America. They all wore special T-shirts. 20 it was “Run, Jeff, Run, Jeff Keith’s Run Across America”. Jeff Keith ran across the United States from the east to the west 21 he was twenty-two years old. He started running in Boston(波士顿). Seven 22 later, he stopped 23 in Los Angeles（洛杉矶）. He ran 3,200 miles (1 mile =" 1.6093km)." Jeff wore out thirty-six pairs 24 running shoes and five plastic legs. Jeff 25 in cities on the way to Los Angeles. In every city people gave Jeff money. The money was not for Jeff, 26 for the American Cancer Society. The Society used the money to help people know 27 about cancer. On the way to Los Angeles, Jeff talked to people about 28 . Jeff is disabled, but he can do many things. He finished college and is studying to be a lawyer(律师). Jeff says, “People can do 29 they want to do. I want people to know that. I ran 30 for disabled people. I ran for everybody.”
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