已知圆C的方程为(x-1)2+(y-2)2=4,则圆C的圆心坐标和半径r分别为

题型:选择题

问题:

已知圆C的方程为(x-1)2+(y-2)2=4,则圆C的圆心坐标和半径r分别为   [ ]

A.(1,2),r=2

B.(-1,-2),r=2

C.(1,2),r=4

D.(-1,-2),r=4

考点:圆的标准方程与一般方程
题型:选择题
— Shall I give you a ride to the airport?
— Thank you. _____.

A. If you like
B. It couldn't be better
C. Of course, you can
D. It's up to you
题型:选择题

3._________last year, the number of people traveling this holiday weekend is expected to increase slightly.

A.Being compared to

B.Comparing to

C.Compared with

D.Comparing with

题型:选择题

设U为所有属性,X、Y、Z为属性集,Z=U-X-Y。下列关于函数依赖和多值依赖的叙述中,哪些是正确的( )
Ⅰ.若X→Y,则X→→Y
Ⅱ.若X→→Y,则X→Y
Ⅲ.若X→Y,则X→Z
Ⅳ.若X→→Y,则X→→Z
Ⅴ.若X→→Y,

则X→→Y'

A.仅Ⅰ、Ⅱ和Ⅲ
B.仅Ⅱ、Ⅲ和Ⅴ
C.仅Ⅰ和Ⅳ
D.仅Ⅳ和Ⅴ

题型:选择题

下列哪项不属于慢性胆囊炎的临床表现()

A.嗳气

B.腹胀

C.胆绞痛

D.右腰背部隐痛

E.畏寒、高热,黄疸

题型:选择题

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