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【单选题】
有两个关系R和S如下 则由关系R得到关系S的操作是A.
自然连接
B.
并
C.
选择
D.
投影
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举一反三
【单选题】All the vegetables in the shop _____. [ ]
A.
have been sold up
B.
has been sold up
C.
have sold up
D.
has sold up
【多选题】下列关于新民主主义社会的说法,正确的有: ( )?
A.
新民主主义社会是一个过渡性的社会
B.
过渡时期我国社会的性质是新民主主义社会
C.
从中华人民共和国成立到社会主义改造基本完成，是我国从新民主主义到社会主义的过渡时期
D.
新民主主义社会存在五种经济成份
【单选题】A：I've just heard that the tickets for Swan Lake have been sold out! B：Oh, no!______
A.
I was looking forward to it.
B.
It doesn't matter.
C.
It's not at all interesting.
D.
I knew it already.
【单选题】What a pity! I hear they _______ the tickets for the concert. [ ]
A.
have sold out
B.
are selling out
C.
sold out
D.
had sold out
【简答题】假想用剖切面剖开物体,将处在观察者和剖切面之间的部分移去,而将其余部分向投影面投射所得的图形,称为 。
【单选题】—I just heard that the tickets for tonight's show have been sold out. —Oh, no！________.
A.
I was looking forward to that
B.
It doesn't matter
C.
I knew it already
D.
It's not at all interesting
【单选题】--- I just heard that the tickets for tonight s show have been sold out. --- _______.
A.
Oh no! I was looking forward to that
B.
Oh no! It doesn t matter
C.
Oh no! I knew it already
D.
Oh no! It s not at all interesting
【简答题】假想用剖切面剖开物体,将处在观察者和剖切面之间的物体移走,而将其余部分向投影面投影所得到的识图称为____。
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