... plunger connecting rod 柱塞连杆 plunger contact 插棒接点 plunger control spring 柱塞控制簧 ...
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contact plunger 接触活塞
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Limit switches are most often mechanical and are activated by physical contact with either a lever or plunger.
限位开关多数情况下是机械式，并靠控制杆或压杆进行物理接触激发的。
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