低压报警开关
low pressure warning switch
开关警报指示器识别
switch warning indicator identification
开关警报指示器问题
switch warning indicator problem
气压报警开关
air warning pressure switch
压力驱动的报警开关
pressure actuated alarm switch
棒漂移警报和试验开关
rod drift alarm and test switch
低机油压力警报器开关
low oil pressure alarm switch
低机油油面警报器开关
low oil level alarm switch