?? ????????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?????????:????wx

2??????????

3???????????

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??????

?????:??