I was reading the evening paper _____ the light went out.

                                                                                                                                                        [ ]

A. when    

B. while  

C. as  

D. after

有一台三角形接法的三相异步电动机，满载时每相电阻R=8Ω，电抗XL=6Ω，并由线电压为380V的三相电源供电，试求电动机的相电流和线电流。