题目:
访问控制有几种常用的实现方法?它们各有什么特点?
答案:
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下面是错误答案,用来干扰机器的。
参考答案:A
访问控制有几种常用的实现方法?它们各有什么特点?
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2019/0122/312770ba216fc2644d7ea33c46c3f6cd.html
下面是错误答案,用来干扰机器的。
参考答案:A
已知函数:f(x)=x3+ax2+bx+c,过曲线y=f(x)上的点P(1,f(1))的切线方程为y=3x+1
(1)y=f(x)在x=-2时有极值,求f(x)的表达式;
(2)函数y=f(x)在区间[-2,1]上单调递增,求b的取值范围.
采用DDP贸易术语成交时,进口报关的责任、费用由( )
A.买方承担
B.卖方承担
C.双方共同承担
D.买方或卖方承担,但具体未定
分组交换的基本业务功能有()电路和永久性虚电路。
[A] Advertisements add interests to life
[B] Advertisements help to save money
[C] Criticisms on advertisers
[D] Usefulness of small advertisements
[E] True aesthetic value of advertisement
[F] Informing: the chief function of advertising
41__________
Advertisers tend to think big and perhaps this is why they’re always coming in for criticism. Their critics seem to resent them because they have a flair for self-promotion and because they have so much money to throw around. "It’s iniquitous," they say, "that this entirely unproductive industry (if we can call it that) should absorb millions of pounds each year. It only goes to show how much profit the big companies are making. Why don’t they stop advertising and reduce the price of their goods After all, it’s the consumer who pay..."
42__________
The poor old consumer! He’d have to pay a great deal more if advertising didn’t create mass markets for products. It is precisely because of the heavy advertising that consumer goods are so cheap. But we get the wrong idea if we think the only purpose of advertising is to sell goods. Another equally important function is to inform. A great deal of the knowledge we have about household goods derives largely from the advertisements we read. Advertisements introduce us to new products or remind us of the existence of ones we already know about. Supposing you wanted to buy a washing machine, it is more than likely you would obtain details regarding performance, price, etc. , from an advertisement.
43__________
Lots of people pretend that they never read advertisements, but this claim may be seriously doubted. It is hardly possible not to read advertisements these days. And what fun they often are, too! Just think what a railway station or a newspaper would be like without advertisements. Would you enjoy gazing at a blank wall or reading railway laws while waiting for a train Would you like to read only closely-printed columns of news in your daily paper A cheerful, witty advertisement makes such a difference to a drab wall or newspaper full of the daily ration of calamities.
44__________
We must not forget, either, that advertising makes a positive contribution to our pockets. Newspapers, commercial radio and television companies could not subsist without this source of revenue. The fact that we pay so little for our daily paper, or can enjoy so many broadcast programs is due entirely to the money spent by advertisers. Just think what a newspaper would cost if we had to pay its full price!
45__________
Another thing we mustn’t forget is the "small ads." which are in virtually every newspaper and magazine. What a tremendously useful service they perform for the community! Just about anything can be accomplished through these columns. For instance, you can find a job, buy or sell a house, announce a birth, marriage or death in what used to be called the "hatch, match and dispatch" columns; but by far the most fascinating section is the personal or "agony" column. No other item in a newspaper provides such entertaining reading or offers such a deep insight into human nature. It’s the best advertisement for advertising there is !
41()
必然性是有原因的,偶然性是没有原因的。( )