同步发电机电枢绕组中空载电动势是由（）产生的。
A．主磁极磁通
B．电枢反应磁通
C．定子漏磁通
D．主磁极磁通和电枢反应磁通共同作用
参考答案：A
The basketball coach, as well as his team, ________ interviewed shortly after the match for their
outstanding performance. [ ]
A. were
B. was
C. is
D. are
文化、教育、卫生等社会公益性项目的( )主要是改善人们的工作、活动空间和环境，提高生活质量，满足人民不断增长的物质文化生活需要。
A．效益目标
B．规模目标
C．功能目标
D．宏观目标
