有一台直流发电机,在某一工作状态下测得该机端电压U=230V,内阻R0=0.2Ω,输出电流I=5A,求发电机的电动势E、负载电阻Rf和输出功率P各为多少?
参考答案:
根据规划方法原则,近期建设规划应当包括在()内。
A.控制性详细规划
B.分区规划
C.规划纲要
D.城市总体规划
We were stuck at the airport because of the heavy fog, otherwise we ________ here in time for the conference.
A.arrived
B.had arrived
C.would arrive
D.would have arrived