问题
单项选择题
NULL是指______。
A.0
B.空格
C.未知的值或无任何值
D.空字符串
答案
参考答案:C
解析: 此题属于记忆性的题目,NULL是指未知的值或无任何值。
NULL是指______。
A.0
B.空格
C.未知的值或无任何值
D.空字符串
参考答案:C
解析: 此题属于记忆性的题目,NULL是指未知的值或无任何值。
用方框中所给的词语的适当形势填空,使短文正确、通顺、连贯(每词限用一次)
4 them . If we 5 our zoos, they won’t have enough money to take care of so 6 fine animals. Therefore, People should go and visit the zoos more often to learn about animals and help to protect them 7 . However, some people don’t think so. They think zoos are terrible places for animals to live.“I’ve visited a lot of zoos in my life, and I have never seen one I like or one that 8 animals to live in .”Jenny said The animals 9 in small cages and can 10 move at all .What’s more, they are only given food once a week That’s terrible. |