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【简答题】
在极坐标系中，圆ρ=2cosθ的圆心的极坐标是 ______，它与方程 θ= π 4 （ρ＞0）所表示的图形的交点的极坐标是 ______．
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皮皮学刷刷变学霸
举一反三
【单选题】Middle East countries ______ their oil revenues into other forms of wealth, such as buildings, food, etc..
A.
turned
B.
altered
C.
transformed
D.
converted
【单选题】What apparently had happened, three years ago, was that Kate _____ to a different building.
A.
went
B.
has gone
C.
had gone
D.
would go
【单选题】Which of the following sentences is grammatically INCORRECT?
A.
He was seen enter the building.
B.
The property was bought for David.
C.
The room is being painted blue.
D.
The little baby has to be left behind.
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