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

2????????

3????????

4???????

5??????????

????????????6????16?? ?????,?????6????????16?????18?:??,6?????16?20??????????17???????????20?????????,???????????????????????????????????????????????????????????,??,??????????????????????????????????????????,???????????????(250~270????)?????(?????????????30~50?????????????,????70??),????

?????:????

?????:

1.??;

2.??????????,????;

3.??????,?????;

4.????????,????????????????????????????????

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