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A. It was invented during World War II.
B. It was available in people's homes since 1902.
C. It was invented by Willis Carrier.
D. It was available immediately after its invention.

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A. He was often offered an ice-cold drink after work.
B. He always wore wet clothes to keep cool.
C. He kept cool in summer by swimming in a stream.
D. He was happy to get sunburned when working outside.

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[音频]

A A weather machine.
B A personal ice cream machine.
C A portable air conditioner.
D Air-conditioning clothes.

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在E-R模型向关系模型转换时，M:N的联系转换为关系模式时，其关键字是（）。

A. M端实体的关键字
B. N端实体的关键字
C. M,N端实体的关键字组合
D. 重新选取其他属性

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大多数细菌繁殖一代所需时间为:

A. l0分钟
B. 20分钟
C. 40分钟
D. l小时
E. 2小时

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[音频]

A. It was invented during World War II. B. It was available in people's homes since 1902. C. It was invented by Willis Carrier. D. It was available immediately after its invention.

[音频]

[音频]

在E-R模型向关系模型转换时，M:N的联系转换为关系模式时，其关键字是（ ）。

大多数细菌繁殖一代所需时间为:

A. It was invented during World War II.
B. It was available in people's homes since 1902.
C. It was invented by Willis Carrier.
D. It was available immediately after its invention.

在E-R模型向关系模型转换时，M:N的联系转换为关系模式时，其关键字是（）。