动不平衡状态下旋转件旋转时不仅会产生垂直旋转轴线的振动，还会产生使旋转轴（）的振动。
A.平行
B.垂直
C.倾斜
D.断裂
参考答案：C
研究并发现通过导体的电流与它两端电压之间的关系，是具有里程碑意义的电学发现，做出这一贡献的科学家是
A．欧姆
B．焦耳
C．奥斯特
D．法拉第
Little about her own safety when trying to save the poor blind man, though she was in great danger
herself. [ ]
A. did Rose care
B. Rose did care
C. Rose does care
D. does Rose care
