缺陷病毒本质上是指() ["基因组缺陷","复制周期不全","病毒酶缺陷","包膜刺突缺陷","衣壳缺陷"]
属于n-3脂肪酸的是()。 ["油酸","磷脂","α-亚麻酸","γ-亚麻酸","棕榈酸"]
关于HBeAg,错误的是() ["A.绝大多数见于HBsAg阳性血清中","B.是一种可溶性抗原","C.是HBV复制活跃的标志","D.可刺激机体产生抗-HBe","E.存在于三种颗粒中"]
有关细菌营养的说法哪一项是错误的?() ["细菌可分为两大营养类型","自营菌所需能源来自无机物","异养菌能利用简单的无机物为原料","所有病原菌都是异养菌","异养菌包括腐生菌和寄生菌两大类"]
急性病毒感染的炎症部位的主要浸润细胞是() ["NK细胞","嗜酸性粒细胞","嗜碱性粒细胞","单个核细胞","中性粒细胞"]
国际上最公立的商检机构是瑞士的(),在我国主要城市也设有办事机构。