寄生虫免疫逃避的含义是指寄生虫() A.抗原变异 B.对抗宿主免疫力的攻击而继续生存 发布时间:2017-05-06 22:12 │ 来源:www.tikuol.com 题型:单项选择题 A1型题 问题: 寄生虫免疫逃避的含义是指寄生虫()A.抗原变异B.对抗宿主免疫力的攻击而继续生存C.改变宿主的免疫应答D.释放可溶性抗原E.抗体变异
题型:单项选择题 A1型题 Financial derivatives also provide a powerful tool for limiting risks that individuals and firms face in the ordinary conduct of their business. This is an example of:A.A. trading efficiency. B.B. speculation. C.C. risk management. 查看答案