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

?:??

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

1.??????;

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

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

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

?????:??? ??“??????”

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

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

2???????

3????????

4????????

5????????????

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

?:??

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

1.??????;

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

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

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

?????:???