??????????????????????????????????????????A??B??????????????????11???4?????????20??????????????????????OK????????????????????????????????????????????“???”?????
???????????????????????????????1.8?X 2???????????????????1.5????????????1??????????????????????????????
?????????????????2??????1.8?X 2????????????????????????????1.5*2??????????2???????1.8?????2??
????????????????1?4???1???????6?
???A?????14?
???B?????11?
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