The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval（）.
- AThey are not subject to permanent magnetism; no check is necessary
- BSemiannually
- CAnnually
- DEvery five year
问题
The Flinders bar and the quadrantal sp
参考解析：
分类：磁罗经与陀螺罗经的使用题库
相关推荐
-
1、The man directing and supervising the
The man directing and supervising the work of stevedores is the（）.ALocal agentBWatchmanCDockerDForema
-
2、Study the information and the relevan
Study the information and the relevant configuration file below for the Testking Branch routerWhat additional command must be executed on the Br...
-
3、The modern （）and （）are the descendants
The modern （）and （）are the descendants of the Gaels of the Celtic tribes.
-
4、The purpose of the stripping bar on an
The purpose of the stripping bar on an anchor windlass is to（）.Aclean off any mud that may have accumulated on the chainBengage or disengage the wildcatCfairlead the chain from the hawse pipe to the wildcatDprevent the chain from fouling the wildcat
-
5、The watches and the the camera materia
The watches and the the camera materials were not stowed in the poop cabin. They were stowed in the chief officer’s cabin（）.AinsteadBinstead ofCreplaceDreplace of
-
6、The Flinders bar on a magnetic compass
The Flinders bar on a magnetic compass compensates for the（）.Ainduced magnetism in vertical soft ironBinduced magnetism in horizontal soft ironCpermanent magnetism in ship's steelDvessel's inclination from the vertical