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软件的何种性能是指软件只允许被授权用户使用(包括读、写、打印、浏览等)？(64)。
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如图5-1所示为发送者利用非对称加密算法向接收者传送消息的过程，图中a和b处分别是(15)。
有以下程序 void fun(char *c, int D) { *c-*c+1;d=d+1; printf("%c, %c,",*c, D) ;}main(){ char a='A', b='a'; fun(&b, A) ; printf("%c, %c\n", a, B) ;} 程序运行后的输出结果是
When the saver needs his money back, he does not have to go to the company with whom he originally placed it. Instead, he sells his shares through a stockbroker to some other saver who is seeking to invest his money.
Many of the services needed both by industry and by each of us are provided by the Government or by local authorities. Without hospitals, roads, electricity, telephones, railways, this country could not function. All these require continuous spending on new equipment and new development if they are to serve us properly, requiring more money than is raised through taxes alone. The government, local authorities, and nationalized industries therefore frequently need to borrow money to finance major capital spending, and they, too, come to The Stock Exchange.
There is hardly a man or woman in this country whose job or whose standard of living does not depend on the ability of his or her employers to raise money to finance new development. In one way or another this new money must come from the savings of the country. The Stock Exchange exists to provide a channel through which these savings can reach those who need finance.
Almost all companies involved in new production and development must ______.
听力原文：M: I hear you and Mike are engaged at last.
W: Yes, we are.
M: When are you getting married？
W: In spring.
M: That's wonderful. Where is the wedding going to be？
W: We are not sure yet. Perhaps in New York .
M: Oh, yes. I remember your parents live there, don't they？
W: Yes, that's right.
M: Where are you going to live？
W: We are going to buy a small house somewhere in New York.
When is she getting married？
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