【单选题】When people try to explain a phenomenon, their goal is
A.
to convince other people that the phenomenon occurred.
B.
to increase their understanding of why the phenomenon occurred.
C.
to predict that a phenomenon will occur.
D.
to establish that a phenomenon will occur.
【单选题】What happens when people try to quit smoking gradually ?
A.
They find it even more difficult.
B.
They are simply unable to make it.
C.
They show fewer withdrawal symptom.
D.
They feel much less pain in the process.
【判断题】在关系中,非主属性Y完全依赖于主属性X,也称Y完全依赖于关系的主键。( )
【判断题】(末考:基础知识部分)在关系中,如果关系的主键是X且X决定非主属性Y,则称Y完全依赖于关系的主键。( )
【判断题】锥形基础施工时,斜面部分可以不支模板,直接用铁锹拍实即可。
【判断题】(末考:基础知识部分)在关系中,如果主属性X决定非主属性Y,则称Y完全依赖于关系的主键。( )
【判断题】在关系中,如果主属性X决定非主属性Y,则称Y完全依赖于关系的主键。( )
【单选题】关于计算机病毒的入侵方式说法错误的是()。
B.
源码病毒,在程序被编译之前插入到FORTRAN
C.
或PASCAL等语言编制的源程序,完成这一工作的病毒程序一般是在语言处理程序或连接程序中C.外壳病毒,易于编写,不易发现
【单选题】When people try to call their doctors during off hours, they usually hear a recorded message instructing them to go to the ________ room in the event of a crisis.