名词
中文翻译：预选开关
同义词：
['预选装置，预选开关，预选控制开关例句：1. The preselection switch is used to control the speed of the motor.（预选开关用于控制电机的速度。）']
例句：
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1. The preselection switch is used to control the speed of the motor.
预选开关用于控制电机的速度。
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2. The preselection switch was designed to improve the efficiency of the system.
预选开关的设计旨在提高系统的效率。
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3. The preselection switch was a critical component in the design of the new circuit board.
预选开关是新电路板设计中的关键组件。