B×3-300型交流弧焊机的空载电压为()。
A.45~60V
B.60~75V
C.75~90V
D.90~105V
参考答案:B
In order to keep fit, I _____ in the park every morning. [ ]
A. work on
B. work at
C. work out
D. work with
男,26岁,上肢血压180~200/100~110mmHg,下肢血压140/80mmHg,体检:肩胛间区可闻及血管杂音,伴震颤,尿17-酮,17-羟类固醇正常,尿苦杏仁酸正常。其高血压原因应考虑为继发于()
A.皮质醇增多症
B.主动脉缩窄
C.嗜铬细胞瘤
D.原发性醛固酮增多症
E.单侧肾动脉狭窄