论文部分内容阅读
1.挂在墙壁上的石英钟,当电池的电能耗尽而停止走动时,其秒针往往停在刻度盘“9”的位置.这是由于针在“9”位置处受到重力矩的阻碍作用最大.
1. The quartz clock hung on the wall, when the battery is depleted and stops walking, the second hand often stops at the dial “9” position. This is because the needle is hindered by the heavy torque at the “9” position. .