目前在全球流生的()是H5N1亚型高热病力禽流感病毒。
参考答案:禽流感病毒
直流电动机电枢回路串入电阻时,串入的电阻越大特性曲线越()。
A、陡;
B、平;
C、转速变化率越大;
D、转速变化率越小;
E、无变化;
___he gave that we should take more exercise in our spare time!
A.What a good advice
B.How a good advice
C.What good advice
D.How good advice