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

2?????????????

3????????

4?????????

5?????????

6??????18???,?????????????????????????????,???????????????????,?,?“??????????”??????,??“?+”???????????????????,?????????????? ??? 6?????18????????,???,????????????????????????????????,???,??????????????????????????,???“???????????????????????????”??????????,???“??????????+”?????,????????????????????? ??? 6???18?,??????(???????????????????????)??,????,??????,?“???????????????????”?,???“????????????????????????????+”???,????????? ?? 6??????????18?,??????,????,??,???“????????????????????????????????????”???,????“????????????+”????????,?????? ??? 6??18????????,??????????,???,???,?“?????????????????”??????????,???????????????????“??+”????????????,????????????????? ? 6?18?,??????????(??)?????????,???????????????????,??????,???“?????????????????”??,????????????“????+”?,???????? ??? ????????????????????:????