题目内容

[音频][音频]

A. Working outside in the yard.
Baking breakfast in the yard.
C. Making lemon juice.
D. Enjoying the air conditioning.

查看答案
更多问题

[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]

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.

[音频]

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

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

答案查题题库