Whenever I made mistakes, the teacher pointed them out with ______.

A．curiosity

B．satisfaction.

C．envy

D．patience.

400V电机的绝缘合格值是不低于（）兆欧，6KV电机绝缘合格值不低于（）兆欧。电机停电（）天以上的需要测量绝缘。