过点A(2,-3),B(-2,-5),圆心在直线x-2y-3=0上的圆的方程是______.
参考答案:(x+1)2+(y+2)2=10
两药合用,一种药物能使另一种药物原有的功效降低或丧失,这种配伍关系是()
A.相反
B.相畏
C.相杀
D.相恶
E.相使
We are now enjoying the cool air in the room.________,the farmers are harvesting crops in the hot sun.[ ]
A.Therefore
B.Besides
C.As a result
D.In the meantime