嗜异凝集试验是诊断传染性单核细胞增多症的检测方法之一,其具有诊断价值的抗原效价应高于()
A.1:8
B.1:16
C.1:32
D.1:64
E.1:128
参考答案:D
— I’ve shown you all the interesting and important places of our school.
— Thank you for so much time.
A.taking
B.spending
C.costing
D.having
我国农业产业化经营有哪几种形式,它有什么特点?