所驻乡镇畜牧服务中心的派驻检疫人员代表()执行规定范围内的检疫任务。
A、乡镇畜牧服务中心
B、动物卫生监督机构
C、乡(镇)政府
D、畜牧兽医局
参考答案:B
I shall never forget the days _____ I spent in Beijing University, _____ has a great effect on my life. [ ]
A. that; which
B. which; that
C. when; that
D. when; which
干扰电疗时,兴奋交感神经,使正常肌发生单收缩或使失神经肌和平滑肌发生单收缩选用差频的原则是()。
A.100Hz
B.50~100Hz
C.25~50Hz
D.20~40Hz
E.1~10Hz