2???21???????????????,??????????????�TIR+??????????????�??????????????????????,?????TIR????�???�?????,??????�????????�??????,??,??(??? ????????????????? ?)

???:????

�????????�_????

?? ????�TIR+????�???????

????:1?????????:????

2???????

3???????200??500

4????????????

5????????

2???21???????????????,??????????????�TIR+??????????????�??????????????????????,?????TIR????�???�?????,??????�????????�??????,??,??(??? ????????????????? ?)

???:????