?????? ????????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???????????

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????

???????:???