同义词
1)effective multiplication factor,有效倍增系数2)effective neutron multiplication factor,中子有效倍增系数3)keff (effective multiplication factor),有效增殖系数，有效倍增因子4)effective multiplication constant,有效倍增常数5)effective multiplication factor,有效倍增因数6)effective frequency_doubling coefficient,有效倍频系数
