A:to sto
B:stopping
C:to have stopped
D:having stopped
下列有关内环境和稳态的说法,不正确的是( )
已知某组数据采用了四种不同的回归方程进行回归分析,则回归效果最好的相关指数R2的值是( )
Can you help me____ ____my dog?