选择符的英文：
selector

wave mode selector
波模选择器

Of a selector, a moving contact that engages with the contacts of a bank.
与存储单元的触点相啮合的选择器滑动触点。

The rotating cylinder with spiral grooves acts as a speed selector
螺旋切口的旋转圆筒作为速率筛选器。

You will try this out by creating a selector that performs a simple dispatch.
您将通过创建执行简单分派的选择器来尝试此操作。

Set the main switch selector to A (auto) or M (manual).
把主选择开关转到A(自动)或M(手动)