??????50?? ???????????“???”

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

7?4????????????????????????,???,?????50????,????????“????”?????????,????????

“????????????????????????????”???,???1998????????? CCD??????“1998QJ5”(????????)????????????????????“?????”????140???????????????,?????4.47????????????,??????????????????????6?,???2.1????

???????????????????????,?????????????,??????????????,????222??????????????????????????????????????????????????

??????????,??????,????????????“????????????????????????”????,????????????????????????????????,???(?????????? ?)

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