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在压限器的使用中一般限幅器的压缩比选得比压缩器的压缩比大。( )

A. 对
B. 错

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Questions 11 to 18 are based on the conversation you have just heard.

A. Peter is visiting his mother.
B. Peter will be unable to come.
C. Peter’s mother is coming for dinner.
D. Peter can’t hear them.

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Questions 11 to 18 are based on the conversation you have just heard.

At a restaurant.
B. In a store specializing in seashells.
C. On a fishing boat.
D. In the fresh ocean air.

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Any mistake made in the printing of a stamp raises its value to stamp collectors. A mistake on one inexpensive postage stamp has made the stamp worth a million and a half times its original value.The mistake was made more than a hundred years ago in the British colony of Mauritius, a small island in the Indian Ocean. In 1847 an order for stamps was sent to a London printer. As a result, Mauritius was to become the fourth country in the world to issue stamps.Before the order was filled and delivered, a ball was planned at Mauritius’ Government House, and stamps were needed to send out the invitations. A local printer was told to copy the design for the stamps. He accidentally inscribed (记下) the words "Post Office" instead of "Post Paid" on the several hundred stamps that he printed.Today there are only twenty-six of these misprinted stamps left: fourteen One Penny Orange— Reds and twelve Two Penny Blues. Because of the Two Penny Blue’s rareness and age, collectors have paid as much as $16,800 for it. A stamp with any mistake in the printing can raise its value if ().

A. most stamp collectors like the mistake made in printing
B. the mistake was made more than a hundred years ago
C. the mistake was made in the British colony of Mauritius
D. the stamp became rare and with a long history

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在数据库的体系结构中，数据库存储的改变会引起内模式的改变。为使数据库的模式保持不变，而且不必修改应用程序，必须通过改变模式与内模式之间的映象来实现。这样，使数据库具有【2】。

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在压限器的使用中一般限幅器的压缩比选得比压缩器的压缩比大。( )

A. 对 B. 错

Questions 11 to 18 are based on the conversation you have just heard.

Questions 11 to 18 are based on the conversation you have just heard.

在数据库的体系结构中，数据库存储的改变会引起内模式的改变。为使数据库的模式保持不变，而且不必修改应用程序，必须通过改变模式与内模式之间的映象来实现。这样，使数据库具有 【2】 。

A. 对
B. 错

在数据库的体系结构中，数据库存储的改变会引起内模式的改变。为使数据库的模式保持不变，而且不必修改应用程序，必须通过改变模式与内模式之间的映象来实现。这样，使数据库具有【2】。