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【单选题】
对表进行水平方向的分割用的运算是()。A.
连接
B.
求交
C.
选择
D.
投影
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【单选题】(2013·合肥一检)According to the rules and regulations, all payments ________ be made in cash in the shopping center.
A.
shall
B.
can
C.
must
D.
should
【单选题】In the United States,contractors must earn their progress payments,and no ( ) are made.
A.
working capital
B.
final account
C.
cost estimate
D.
up-front payments
【单选题】Don’t worry, sir! All payments ____ be made by the end of the month.
A.
will
B.
shall
C.
can
D.
must
【单选题】A ______ selected as a matrix material combined with a reinforcement in any form and quantity produces a PMC.
A.
Polymer
B.
Metal
C.
Ceramic
D.
Alloy
【简答题】某数字图像的颜色深度为 8 位,则该图像中可能出现的不同颜色的最大数目为 __________ 种。
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