- you a radio?
-No, I .
A:Are; have; are
B:Do; have; don't
C:Do; has; don't
D:Does; have; do
鱼能在水中生存的原因是( )
任取实数a、b∈-1,1,则a、b满足a-2b≤2的概率为( )
函数fx=x-1x+1设f1(x)=f(x),f2x=ff1x,﹒﹒﹒fnx=ffn-1x,(x∈N+,N≥2),令集合M={x∣f2008x=x2,x∈R}则集合M为( )