? ?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????????:????600?????

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??????

?????????????:???