A、opposite polarity
B、the same polarity
C、negative polarity
D、positive polarity
更多“The magnetic field is provided by electromagnets so arranged that adjacent poles have （）.”相关的问题
A、induced magnetism in the vessel's horizontal soft iron B、change in the magnetic field when the vessel inclines from vertical C、permanent magnetism of the vessel D、magnetic fields caused by electrical currents in the vicinity
A、operation of electrical equipment and generators on board ship B、the earth's magnetic field affecting the ship's hard iron during construction C、the horizontal component of the earth's magnetic field acting on the horizontal soft iron D、the vertical component of the earth's magnetic field acting on the vertical soft iron
A、A.hammering and jarring B、B.vibration and pounding C、C.varying magnetic fields D、D.stable or permanent magnetism of the ship
A、magnetism from the earth's magnetic field B、misalignment of the compass C、magnetism within the vessel D、a dirty compass housing
A、The Flinders bar B、The heeling magnet C、Quadrantal soft iron spheres D、Bar magnets in the binnacle
A、A.magnetism from the earth's magnetic field B、B.misalignment of the compass C、C.magnetism within the vessel D、D.a dirty compass housing
A、Worn gears in the compass housing B、Magnetism from the earth's magnetic field C、Magnetism within the vessel D、Lack of oil in the compass bearings
A、A.worn gears in the compass housing B、B.magnetism from the earth's magnetic field C、C.magnetism within the vessel D、D.lack of oil in the compass bearings
A、A.changes in the earth's magnetic field B、B.nearby magnetic land masses or mineral deposits C、C.magnetic influence inherent to that particular vessel D、D.the magnetic lines of force not coinciding with the lines of longitude
A、increase the field excitation B、decrease the field excitation C、increase the number of magnetic poles D、increase the speed of the prime mover
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