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【多选题】
计算二重积分 ,其中 是由直线 , 及 轴所围成的闭区域,下列正确的有( ).A.
若 看成 -型,则
B.
若 看成 -型,则
C.
D.
=5e
E.
=4
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反馈参考答案：
举一反三
【简答题】具有‘独木成林’之称的树种是 ——
【简答题】A．fought for B．fighting for C．fought D．fighting
【单选题】Fierce fighting broke out between the ________ groups.
A.
outward
B.
visual
C.
irrational
D.
rival
【简答题】Both sides have been ________________ their positions after yesterday's fierce fighting. (reinforce)
【单选题】Fierce fighting broke out between the( )groups.
A.
friendly
B.
rival
C.
beloved
D.
intimate
【单选题】After a day's fierce fighting, the enemy finally had to remove their troops from the occupied area.
A.
retreat
B.
return
C.
dismiss
D.
withdraw
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