???? ??????????????2??6?18??????:

????????????????????,???,2??6?20??8??20??,?????????????6~8?,???????????,?10???;????????4~6?,????7~8?,????????????10??????????????????8?,??????0?????????????????????,??????6~8??

qxtx

qxtx

??????????:

1?????;

2??;

3???????????????;

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

??:?????? ??“????”

?? ??????:?????????????10???

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

2??????

3?????90????????

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

5??????????

???? ??????????????2??6?18??????:

????????????????????,???,2??6?20??8??20??,?????????????6~8?,???????????,?10???;????????4~6?,????7~8?,????????????10??????????????????8?,??????0?????????????????????,??????6~8??

qxtx

qxtx

??????????:

1?????;

2??;

3???????????????;

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

??:??????