搜题请搜索小程序“爱下问搜题”
问题 单项选择题

要控制两个表中数据的完整性和一致性，可以设置参照完整性，要求这两个表

A．是同一个数据库中的两个表

B．是不同数据库中的两个表

C．是两个自由表

D．一个数据库表，另一个是自由表

答案

参考答案：A

解析：【解析】设置参照完整性必须在数据库中完成，因此要求这两个数据表必须在同一个数据库中。

选择题

在十一届三中全会后的20多年时间里，全国人大及其常务委员会制定和通过了300多个法律和有关法律问题的决定，地方人大制定了4000多项地方性法规。这说明（ ）

①全国人民代表大会是我国的最高立法机构 ②人民代表大会制度是我国的根本政治制度 ③我国社会主义法制在不断健全和完善 ④各级地方人民代表大会有制定法律的权力

A．①②④

B．②③④

C．①③

D．①③④
查看答案
单项选择题

Uncle Li and Uncle Wang are good friends. They live next to each other and their farms are both at the foot of the mountain. So they can help each other. But neither of them likes to use his head. They’re both poor though they work hard. Most villagers have built new houses, but they still live in the low and broken houses. They never find out why.
Once Uncle Li went to the town to buy some medicine for his wife. In the town he heard apples in a city were expensive. He told Uncle Wang about it as soon as he went back. They decided to carry some apples to the city. They borrowed some money from their friends and bought nearly 1,000 kilograms of apples in the villages and carried them to the city on a tractor. Bad luck! A lot of apples has already been carried there when they arrived. A few days later they had to sell them at a low price. They felt unhappy and returned to their village.
"I can’t understand why we sustained (蒙受) losses in business while others always profit (盈利)" Uncle Li asked one day.
"The tractor was too small" Uncle Wang said without thinking. "We’ll carry more apples on a truck next time!"
"I agree!" said Uncle Li. "How foolish we were!\

Which of the following is TRUE

A．The two farmers found out why they were poor.

B．The two farmers will soon get rich.

C．Neither of the farmers is clever.

D．The two farmers decided to buy a truck.
查看答案