标准线轴形变幅杆
一种线轴形变幅杆，其底切从前端法兰一直延伸到大致轴向波节处。标准线轴形变幅杆的增益高于全线轴形变幅杆，且由于肩台更长，从后端进行调谐更容易。
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另见高增益线轴形变幅杆。
Standard spool horn
A spool horn in which the undercut extends from the front flange to approximately the axial node. The standard spool horn has higher gain than the full spool horn, and is easier to tune from the back because the shoulder is longer.
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Also see high gain spool.