They suggested that the professor ________ just now ________ chairman of the meeting.

A．referring to；was made

B．referring to；be made

C．referred to；be made

D．referred to；was made

ZDl05型电机进行空载试验在无负荷情况下通入直流电源，使电机转速达到1850r／rain，正反运转各（），再检查轴承、换向器电刷。

A、10min

B、20min

C、30min

D、40min