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问题 单项选择题

详细设计的结果基本决定了最终程序的( )。

A．代码的规模

B．运行速度

C．质量

D．可维护性

答案

参考答案：C

解析：详细设计阶段的根本目标是确定应该怎样具体的实现所要求的系统，但详细设计阶段的任务还不是具体的编写程序，而是要设计出程序的“蓝图”，以后程序员将根据这个蓝图写出实际的程序代码，因此，详细设计阶段的结果基本上就决定了最终的程序代码的质量。

问答题

设A为三阶实对称矩阵，且其特征值为λ1=λ2=1，λ3=0，假设ξ1，ξ2是矩阵A的不同特征向量，且A(ξ1+ξ2)=ξ2．
(Ⅰ) 证明：ξ1，ξ2正交；
(Ⅱ) 求方程组AX=ξ2的通解．
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单项选择题

Euthanasia has been a topic of controversy in Europe since at least 1936. On an average of six times a day, a doctor in Holland practices "active" euthanasia: (1) administering a lethal drug to a (2) ill patient who has asked to be relieved (3) suffering. Twenty times a day, life prolonging treatment is withheld or withdrawn (4) there is no hope that it can (5) an ultimate cure. "Active" euthanasia remains a crime on the Dutch statute books, punishable (6) 12 years in prison. But a series of court cases over the past 15 years has made it clear that a competent physician who (7) it out will not be prosecuted.

Euthanasia, often called "mercy killing", is a crime everywhere in Western Europe. (8) more and more doctors and nurses in Britain, Germany, Holland and elsewhere readily (9) to practicing it, most often in the "passive" form of withholding or withdrawing (10) The long simmering euthanasia issue has lately (11) into a sometimes fierce public debate, (12) both sides claiming the mantle of ultimate righteousness. Those (13) to the practice see themselves (14) sacred principles of respect for life, (15) those in favor raise the banner of humane treatment. After years (16) the defensive, the advocates now seem to be (17) ground. Recent polls in Britain show that 72 percent of British (18) favor euthanasia in some circumstances. An astonishing 76 percent of (19) to a poll taken late last year in France said they would like the law changed to (20) mercy killings. Obviously, pressure groups favoring euthanasia and "assisted suicide" have grown steadily in Europe over the years.

7（）

A.works

B.saves

C.carries

D.rescues
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