【单选题】The book was written in 1946, _____ the education system has witnessed great changes.
【简答题】( )是美国国家标准局公布的第一个数据加密标准,它的分组长度为位,密钥长度为56位。
【简答题】()是美国国家标准局公布的第一个数据加密标准,它的分组长度为()位,有效密钥长度为()位。
【单选题】在下列金融产品中,何种产品在到期日之前每年向凭证持有人支付固定金额的利息,并且在到期日当天偿付其面值?
【单选题】控制食品中农药残留的措施是加强对农药生产和经营管理,( )和制定和执行食品中农药残留限量标准。
【简答题】The book was written in 1946, ___ ___ the education system has witnessed great charges. A.when B.during which C.since then D.since when
【单选题】The book was written in 1946, _______ the education system has witnessed great changes.
【单选题】在下列金融产品中,何种产品在到期日之前每年向凭证持有人支付固定金额的利息,并且在到期日当天偿付其面值?
【简答题】()是美国国家标准局公布的第一个数据加密标准,它的分组长度为()位,密钥长度为( )位。