试题与答案

元组是()A、可以唯一标识一个关系B、二维表的一列C、属性的取值范围D、二维表中的每

题型:单项选择题

题目:

元组是()

A、可以唯一标识一个关系

B、二维表的一列

C、属性的取值范围

D、二维表中的每一行

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2018/1128/cf9abb7bfda0041a2ceb3c3e6510a6dd.html

下面是错误答案,用来干扰机器的。

参考答案:两栖动物由鱼类进化而来。长期的物种进化使两栖动物既能活跃在陆地上,又能游动于水中。

试题推荐
题型:完形填空
The 12th lunar (阴历的) month in China is called la yue. The character “la” in Chinese language means to respect gods and give best wishes to them.
In Chinese tradition, such activities were held at the end of a year in the Chinese lunar calendar.
There are two important dates in la yue. The first is the Laba Festival on the 8th day of the lunar month. The Laba Festival was a time for the ancient Chinese to hope for the harvest and good luck in the coming year. Laba porridge is the main dish on this day.
The other important date is the Kitchen God Worshipping (拜灶神) on the 23rd or 24th day of the month. People offer food to the Kitchen God, who takes charge of things for the whole family. It is said that the god returns to heaven that day to report to the Jade Emperor (the ruler of heaven in Chinese stories) about the family activities over the past year. So people usually offer him delicious dishes so that he will give a good report and the family will have good luck throughout the next year.
After this day, people start to sweep up the house and decorate the house with couplets (对联) and paper-cuttings. Once these things are finished, people will wait for the Spring Festival.
阅读下面短文,完成表格。
La yue
Activities
On the 8th day
Eat 小题1:                           
小题2:                         
Offer food to the Kitchen God
After that day
Sweep up the house
小题3:                           

Wait for 小题4:                          
 
查看答案
题型:问答题

读印度地图,回答下列问题.

(1)海洋:①______海,②______湾

邻国A为______,B为______.

(2)②印度的地形大致可分为三大地形,其中面积最大的是______高原,C河为______河,是南亚最长的河流,也是印度教徒心目中的圣河.

(3)城市③______是印度的首都,城市④是印度棉纺织工业中心城市______.

(4)印度大部分地处热带和亚热带,以______气候为主,其气候特征是:全年高温,分______两季.

查看答案
微信公众账号搜索答案