electric alarm

• 电警报

electric alarm的用法和样例：

例句

1. Magnetic snap-action electric alarm contacts are used in adverse operating conditions.
   磁性吸合电警报接点用于相反的操作条件。
2. Electric alarm contacts open and close circuits in response to the position of the pressure gauge pointer.
   电警报接点根据压力表指针的位置开启和关闭电路。