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【单选题】
.下列关于关系模型基本性质的描述,正确的是()。A.
同一关系的每一列上，属性值可取不同值域
B.
同一个关系中行和列的顺序无关紧要
C.
统一关系中可以有完全相同的
D.
同一关系中列可在分，列的顺序也可以改变
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举一反三
【单选题】An organizational structure that contains only line positions and no staff positions is referred to as a _____ organization.
A.
line
B.
staff
C.
line-and-staff
D.
tall
【单选题】An organizational structure that contains only line positions and no staff positions is referred to as a _____ organization.
A.
line
B.
staff
C.
line-and-staff
【单选题】A combination of corrosion and erosion caused wastage in the main ballast line，which directly led to the leak ______．
A.
draff
B.
wastage
C.
mullock
D.
obsolete
【单选题】The runners are_________ their positions on the starting line. [ ]
A.
taking up
B.
picking out
C.
turning on
D.
getting down
【单选题】The runners________ several times ________their positions on the starting line, otherwise they will be kicked out.
A.
are warned, making up
B.
warn, to make up
C.
have been warned, to take up
D.
warn, to have taken up
【单选题】A line connecting all possible positions of your vessel at any given time is a __________
A.
longitude line
B.
line of position
C.
latitude line
D.
fix .
【简答题】手持 哑铃 仰卧夹胸运动 可以发展 ___________肌的力量,此时该肌为 固定 收缩。
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