论文部分内容阅读
河北石家庄市环业生物农药厂高级工程师齐凤来,经过多年潜心钻研试验.研制成功一种专治棉铃虫的新型生物病
Qifeng, a senior engineer of the ring biological pesticide factory in Shijiazhuang, Hebei, after years of painstaking research test developed a new biological disease of cotton bollworm