? ????5.7??????????
??1???25? ????,25?,?5.7?????
????????????????,???19?????49???5.7?,?21???6.4????????,?7.7??,??????????43.9??????????????????????????????????????????????????????4??
???????????“?”,??
??????1?????,?4.8????,??????????6.8??,??????????????4????
??????????,???6????????1??,???????5.1???;??????????20??21???,?????????5??????,???3.3?4.5????????????????
???,25???????????19?????49???5.1??????(?) ????:????
??
???:????