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【单选题】
在一个关系模型中,对记录行进行筛选是( )运算A.
投影
B.
连接
C.
选择
D.
组合
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反馈参考答案：
举一反三
【单选题】the hard sleeper compartments are ( ) and comrise six fixed bunks, arranged as an upper, middle and lower berths on either side.
A.
open
B.
closed
C.
private
D.
independent
【单选题】The hard sleeper compartments are ( ) and comprise six fixed bunks, arranged as an upper, middle and lower on either side.
A.
open
B.
closed
C.
private
D.
independent
【单选题】The hard sleeper compartments are ( ) and comprise six fixed bunks, arranged as an upper, middle and lower berths on either side.
A.
open
B.
closed
C.
private
D.
independent
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