4821，99.9%16~1816alpha18，21alpha，alpha，，21，，11，，alpha，，alpha21023:152121omegaoomegaomegaomegaalphaalphaomega50%omega50%5%omegaalphado1~3alpha1~3omegaalphaalphaomegaomega-omegaomegaomegaomegaalphaalphaomegaomega