The Flinders bar on a magnetic compass compensates for the（）.
- Ainduced magnetism in vertical soft iron
- Binduced magnetism in horizontal soft iron
- Cpermanent magnetism in ship's steel
- Dvessel's inclination from the vertical
问题
The Flinders bar on a magnetic compass
参考解析：
分类：磁罗经与陀螺罗经的使用题库
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