【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。( )
【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 symptoms.
D.
They feel much less pain in the process.
【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】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.