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【单选题】
E-R模型属于
A.
概念模型
B.
层次模型
C.
网状模型
D.
关系模型
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举一反三
【单选题】People want to wear what they feel most comfortable. (改为一般疑问句)
A.
Do people want to wear what they feel most comfortable?
B.
Does people want to wear what they feel most comfortable?
C.
Do people want to wear what they feel most comfortable.
【判断题】左手定则是判断磁场方向的。
A.
正确
B.
错误
【单选题】下列函数中属于d^2/dx^2和d/dx的共同的本征函数是 ( )
A.
cos kx
B.
exp(-ikx)
C.
exp(-kx^2)
D.
exp(-kx^4)
【单选题】I was blessed with a happy childhood, ____ that most people would want to have.
A.
it  
B.
one  
C.
/  
D.
the one
【单选题】判断通电导线周围的磁场方向和通电线圈的磁场方向的定律是()。
A.
右手螺旋定则
B.
左手定则
C.
右手定则
【单选题】Why does the matchmaking still exist in Korea?
A.
Because most people want to keep the bloodlines pure and chance encounters romantic.
B.
Because most people try to avoid romance and keep the bloodlines pure.
C.
Because most people regard marriage as continuing family lineage and romance.
D.
Because most people try to break family lineage and bloodlines.
【单选题】医疗机构对新冠肺炎患者,予以隔离治疗,隔离期限确定的依据是( )
A.
医学检查结果
B.
病原携带者未出现临床症状
C.
病人病情好转
D.
由上级卫生行政部门决定
【单选题】下列哪种物质不是嘌呤核苷酸从头合成的直接原料
A.
甘氨酸
B.
天冬氨酸
C.
谷氨酸
D.
CO2
【单选题】属于算符 和 的共同的本征函数的是( )
A.
coskx
B.
e-kx
C.
X2
D.
sinkx
【简答题】Sadness and happiness are often talked about by people in their spare time. Most people want themselves to be happy for ever, but few know how to find happiness. Others say if you own lots of money an...
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