在载玻片上写“q”字，在目镜中看到的物像是（  ）

定义在R上的奇函数$f\left(x\right)$满足：当$x>0$时，$f\left(x\right)={2013}^x+{\log }_{2013}x$，则方程$f\left(x\right)=0$的实数根的个数是（   ）

四边形ABCD的对角线AC、BD相交于点O，且AD∥BC，AD=BC，补上下列条件中①AC=BD；②AB=AD；③AB=CD；④AC⊥BD，能使四边形ABCD为正方形的是（   ）

任务型阅读Sunshine Clothes Store
     Hi, boys and girls! Please come to our store. We have white and blue socks for $3.The black hat is only $4.The T-shirt is on sale for only $6.We have red T-shirts, white T-shirts and black T-shirts. The white sweater is $8, the red sweater is $9 and the blue sweater is $10.We also have black trousers and blue trousers. They are $11.The shorts are $14, and the shoes are $14, too.

如果关于x的一元二次方程kx²﹣$\sqrt{2k+1}$x+1=0有两个不相等的实数根，那么k的取值范围是____