单选题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 necessaryBSemiannuallyCAnnuallyDEvery five years
单选题
The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval（）.
A
They are not subject to permanent magnetism; no check is necessary
B
Semiannually
C
Annually
D
Every five years
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