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【单选题】
关系R、S如表4-48所示，R÷（πA1，A2（σ13（S）））的结果为（1），连接、右外连接和完全外连接的个数分别为（2）。 空白（1）处（）A.
{d}
B.
{c，d}
C.
{c，d，g}
D.
D.{（a，B.，（b，，（c，D.，（d，F.}
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举一反三
【单选题】After a long walk in the sun, they wanted to drink .
A.
cold something
B.
something cold
C.
nothing cold
D.
cold anything
【单选题】After a long walk, Jim was hungry and tired. He could _____ walk any farther. [ ]
A.
suddenly
B.
hardly
C.
luckily
D.
mostly
【单选题】After a long walk we had rest.
A.
a few minute's
B.
a few minutes'
C.
few minute's
D.
few minutes'
【单选题】out after a long walk ,Tom called and said he couldn’t come to the party.
A.
Having worn
B.
Being worn
C.
To wear
D.
Worn
【单选题】After a long walk on a hot day, one feels ______.
A.
exhaustive
B.
possible
C.
exhaust
D.
exhausted
【单选题】I am tired after a long walk. I want to _______.
A.
have a talk
B.
have a rest
C.
have a stop
D.
have a test
【单选题】多层高级住宅中,顶棚装修材料燃烧性能等级为( ),墙面装修材料燃烧性能等级为( )。
A.
A 、 B1
B.
B1 、 B1
C.
B2 、 B1
D.
B2 、 B2
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