对于500伏以下的电动机，其绝缘电阻小于（）MΩ时，就应对电动机进行处理，以提高绝缘电阻。
参考答案：0.5
—After reading the story about Jin Jing, I was very ______. —______ She's really brave.
A. relaxed; So was I B. impressing; So did IC. impressed; So was I D. relaxing; So I did
视频会议的局限性不包括( )。
A．会议成本高 B．初始准备时间长C．初始投入成本高 D．交流不够深入广泛
