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Any piece of metal on becoming magnetized will develop regions of concentrated magnetism called ______．
A.flux
B.poles
C.magnets
D.azimuth
参考答案
更多 “ Any piece of metal on becoming magnetized will develop regions of concentrated magnetism called ______．A.fluxB.polesC.magnetsD.azimuth ” 相关考题
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Why are the 1300 nm and 1550 nm regions of the fiber spectrum primarily used for optical communications?（）A、They are both regions of lowest loss.B、They are both regions of low reflections.C、They are both regions of low index of refraction.D、They are both regions of low chromatic dispersion.E、They are both regions of low Polarization Mode Dispersion (PMD).
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单选题Any piece of metal on becoming magnetized will develop regions of concentrated magnetism called（）.A
fluxB
polesC
magnetsD
azimuth
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单选题To function properly, oil control rings used on a diesel engine piston must distribute sufficient oil to all parts of the cylinder wall and must also（）.A
prevent any lubricant from reachingB
prevent excessive lubrication from reaching the combustion spaceC
Provide metal-to-metal contact to seal the cylinder against blow-byD
assure a positive means of scraping carbon accumulation from the cylinder
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单选题This induced magnetism（）the permanent magnetism already present in the ship.A
will add toB
will subtract fromC
may add to or subtract fromD
will not change
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单选题Prior to reading an aneroid barometer，you should tap the face lightly with your finger to（）.A
expose any loose connectionsB
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bring the pointer to its true positionD
contract and expand the glass face
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单选题The magnetism in the various structures of a ship changing as a result of cruising，vibration，or aging is termed（）.A
permanent magnetismB
subpermanent magnetismC
induced magnetismD
variable magnetism
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单选题When a vessel changes course from one cardinal heading to another cardinal heading whilea djusting the compass，which action should be taken?（）A
The course change should be made rapidly to prevent transient induced magnetism while passing the intercardinal headingsB
After the new heading is reached，the vessel should steam on that course for at least two minutes before the adjustmentC
During the course change，you should gently tap the compass to remove any error caused by friction on the pivot bearingD
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单选题Why are the 1300 nm and 1550 nm regions of the fiber spectrum primarily used for optical communications?（）A
They are both regions of lowest loss.B
They are both regions of low reflections.C
They are both regions of low index of refraction.D
They are both regions of low chromatic dispersion.E
They are both regions of low Polarization Mode Dispersion (PMD).
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单选题The Flinders bar on a magnetic compass compensates for the（）.A
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induced magnetism in horizontal soft ironC
permanent magnetism in ship's steelD
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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 necessaryB
SemiannuallyC
AnnuallyD
Every five years
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单选题A ship under construction or major repair will acquire permanent magnetism due to（）while sitting stationary in the earth’s magnetic field.A
hammering and jarringB
vibration and poundingC
varying magnetic fieldsD
stable or permanent magnetism of the ship
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单选题Why are the 1300 nm and 1550 nm regions of the fiber spectrum primarily used for optical communications？（）A
They are both regions of lowest loss.B
They are both regions of low reflections.C
They are both regions of low index of refraction.D
They are both regions of low chromatic dispersion.E
They are both regions of low Polarization Mode Dispersion （PMD）.
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