Construction and preliminary identification of genetically engineered tetravalent antibodies against parathion .

抗对硫磷基因工程新型抗体的制备及初步鉴定。

Efficacy test of ib part in the tetravalent inactivated vaccine against newcastle disease , infectious bronchitis , egg drop syndrome and avian encephalomyelitis .

鸡新城疫、传染性支气管炎、减蛋综合征、传染性脑脊髓炎四联灭活疫苗ib部分效力试验研究。

A gray tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals ; used in filaments for its ready emission of electrons .

一种灰色的四价金属元素，化学性质与锆相似，发现于锆矿物中，因能迅速释放电子而用作灯丝。