Stream ciphers run on which of the following?()
A. Fixed-length groups of digits called blocks
B. Individual blocks,one at a time,with the transformations varying during the encryption
C. Individual digits,one at a time,with the transformations varying during the encryption
D. Fixed-length groups of bits called block
查看答案
维生素D缺乏症与仔畜断乳过早无关,但与光照不足有关。
A. 正确
B. 错误
《服务质量规范》规定:列车首尾载客车厢侧门和端门运行中锁闭,在内端门设置“旅客止步”标志,有运转车长作业的,()和()由其负责管理,无旅客通行。
A. 后门
B. 侧门
C. 内端门
D. 车门
实现数据恢复的命令是( )
A. mysqldump
B. mysql
C. backup
D. return
下列技术中控制文档结构的是( )。
A. DOM
B. CSS
C. JavaScript
D. XMLHttpRequest