Guangzhou was the second Chinese city_______ the right _______the Asian Games.

A．obtaining; to host

B．to obtain; hosted

C．to obtain; to host

D．obtaining; hosting

旋转磁场的旋转方向与三相电源的（）有关，要使旋转磁场反转，可任意对调三相绕阻上的两根（）。