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【单选题】
设关系模式R(A，B，C)，传递依赖指的是(55)；下列结论错误的是(56)。A.
若A→B，B→C，则A→C
B.
若A→B，A→C， 则A→BC
C.
若A→C，则AB→C
D.
若A→BC，则A→B，A→C
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举一反三
【单选题】There are many more_______secondary windings than there are in the primary windings.
A.
turn
B.
.wire
C.
turns of
D.
turns of wire
【单选题】There are too many________here for me to concentrate on my term paper
A.
Diatractions
B.
Deructions
C.
Derection
D.
Descoveres
【单选题】Many agents quit and say they are leaving because they are_____and want better pay and more humane working conditions, including less travel.
A.
reverted to
B.
backed up
C.
fed up
D.
thrust in
【单选题】The exhibition has to offer that you will find( )interesting．
A.
many
B.
much
C.
many a
D.
more
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