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【多选题】
设 Ω 是由 和 所围成的区域,则三重积分 ( )A.
B.
C.
D.
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反馈参考答案：
举一反三
【单选题】“ __________ were you born?” “On May 12, 1985”. [ ]
A.
What
B.
Which
C.
When
D.
where
【单选题】—When were you born? —____________.
A.
On March nineth
B.
In May 5
C.
On February fifteenth
【单选题】一When were you born? 一I was born ____ the morning of May 7, 1995. [ ]
A.
in
B.
on
C.
at
D.
of
参考解析：
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