According to the "North Carolina DifferentialHost Test" scheme, 16 populations reacted as race 1, and 4 populations as race 2.
按北卡罗来纳小种鉴别法鉴定，16个群体在鉴别寄主上的反应属1号小种，4个群体为2号小种。
2
Infection assay of mutants on Chinese differentialhost shows that virulence of all the mutants changes significantly in contrast with wild-type isolates.
采用中国鉴别寄主对突变体的毒性研究表明，各突变菌株的毒性均较原始菌系发生了明显改变。
3
Host by motor direct start running, differential speed and drum rotational speed adjustment accomplished by frequency converter.