单项选择题
A.350~400,122~126,148~152B.300~350,122~126,148~152C.350~400,130~135,155~160D.300~350,130~135,155~160
A.8B.18C.25D.28
A.繁殖率B.流产率C.平均受胎率D.平均繁殖率