【单选题】在雇员信息表关系EMP中,哪个属性是外键(foreign key)?
【简答题】We will be grateful if you offer us some information ( ) the following points.
【单选题】以下关于热力站内的混水装置叙述不正确的是( )。
A.
混水装置的设计流量等于二级网路供暖用户的循环水量乘以混合比
B.
采用汽—水混合式加热器时,蒸汽的压力至少应比加热器入口水压高出50~100kPa
D.
混水装置的扬程不应小于混水点后用户系统的总阻力
【判断题】and from that a computer is turned on to that the operating system prepares to accept input form the owner, there is a program called bootstrapper downloads the operating system kernel into RAM.
【单选题】"Other viruses modify the operating system in order to camouflage their existence," the word "camouflage" may best mean ______.
【单选题】The DBMS accepts requests for data and instructs the operating system to ______ the appropriate data.
【单选题】We will be grateful if you can provide me _______ necessary information.