单选题:下列各项中属于特异性免疫的是( )。 题目分类:初中生物 题目类型:单选题 查看权限:VIP 题目内容: 下列各项中属于特异性免疫的是( )。 A.体液的杀菌作用 B.吞噬细胞的吞噬作用 C.皮肤的屏障作用 D.淋巴细胞产生抗体,吞噬病原体 参考答案: 答案解析:
设计一张教学挂图,展示菜豆种子的结构。 (1)用示意图的形式展示你设计的挂图,并标出各结构的名称。(10分) (2)利用 设计一张教学挂图,展示菜豆种子的结构。 (1)用示意图的形式展示你设计的挂图,并标出各结构的名称。(10分) (2)利用所设计的挂图设计一个教学活动。(20 分类:初中生物 题型:单选题 查看答案
请阅读短文,完成第题。Polyester (聚酯 ) is now being used for bottles. 请阅读短文,完成第题。Polyester (聚酯 ) is now being used for bottles. ICI, the chemicals 分类:初中生物 题型:单选题 查看答案
Which is the most advantageous relationship mode between tea Which is the most advantageous relationship mode between teachers and students 分类:初中生物 题型:单选题 查看答案
However important wealth is, it should not become our ______ However important wealth is, it should not become our __________in life.A.focus 分类:初中生物 题型:单选题 查看答案
The writer thinks that for a student to have a part-time jo The writer thinks that for a student to have a part-time job is probably_______ 分类:初中生物 题型:单选题 查看答案