单词：limit switch
limit switch的用法和样例：
例句
- Where FF or smart positioners are used on control valves, limit switches are not required.如果基金会现场总线或智能定位器用于控制阀，不要求限位开关。
- Screen should not show any indication, turn the left toggle switch towards you.屏幕上应该没有任何显示，这时将最左上角的那个三位开关掰到离你最近的位置。
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