Lin Hai is ____ years old. His father is a police officer. ____is very busy, but he____his ____. Sometimes he works day and night. Sometimes he works ____holidays. He doesn't ____much time to ____with his son. Lin Hai is very proud of his ____.
如图,四边形ABCD是菱形,∠A=60°,AB=2,扇形BEF的半径为2,圆心角为60°,则图中阴影部分的面积是( )
有四种物质:①细胞,②电子,③原子,④质子.按从大到小排列的顺序是 ( )
下列农作物的栽培过程中,采取的措施与目的不相符的是( )
下列结论:①函数y=x2和y=(x)2是同一函数;②函数f(x﹣1)的定义域为1,2,则函数f(3x2)的定义域为0,33;③函数y=log2(x2+2x﹣3)的递增区间为(﹣1,+∞);其中正确的个数____