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在Magnetic Lasso Tool（磁性套索工具）的选项栏中，Frequency（频率）是用来控制磁性套索工具生成固定点的多少，频率越高，就能越快地固定选择边缘
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更多 “在Magnetic Lasso Tool（磁性套索工具）的选项栏中，Frequency（频率）是用来控制磁性套索工具生成固定点的多少，频率越高，就能越快地固定选择边缘” 相关考题
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Isogonic lines are lines on a chart indicating ______.A.points of equal variationB.points of zero variationC.the magnetic latitudeD.magnetic dip
考题
Lines on a chart which connect points of equal magnetic variation are called ______.A.magnetic latitudesB.magnetic declinationsC.dipD.isogonic lines
考题
Which magnetic compass corrector（s）CANNOT be set on a heading of magnetic east or magnetic west ________．A.Heeling magnetB.Flinders barC.Fore-and-aft magnetsD.All of the above can be set on magnetic east or magnetic west headings
考题
Which magnetic compass corrector（s）can be set while the vessel is on a heading of magnetic north or magnetic south ________．A.Quadrantal spheresB.Heeling magnetsC.Flinders barD.Fore-and-aft magnets
考题
Magnetic compass deviation______．A.varies depending upon the bearing usedB.is the angular difference between magnetic north and compass northC.is published on the compass rose on most nautical chartsD.is the angular difference between geographic and magnetic meridians
考题
Magnetic dip is a measurement of the angle between the ______.A.geographic pole and the magnetic poleB.lubber’s line and true northC.horizontal and the magnetic line of forceD.compass heading and the magnetic heading
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下面有关Select菜单下的Grow（扩大选取）和Similar（选取相似）命令，描述正确的是（）。A、它们都是用来扩大选择范围的B、它们都是根据像素的颜色近似程度来增加选择范围的C、它们的选择范围都是由Magic Wand Tool（魔棒工具）选项栏中的Tolerance（容差）来控制的D、它们的选择范围都是由Magnetic Lasso Tool（磁性套索工具）选项栏中的Edge Contrast（边对比度）来控制的
考题
下列哪些工具不可以在起对应的工具选项栏中使用选区运算？（）A、单行选框工具（Single Row marquee Tool）B、自由套索工具（Lasso Tool）C、喷枪工具（Airbrush Tool）D、魔棒工具（Magic Wand Tool）
考题
用于作为真向或磁向的基准。（）A、It is used as a reference to either true nor magnetic direction.B、It is used as a reference to either true or magnetic direction.C、It is used as a reference to neither true or magnetic direction.D、It is used as a reference to neither true nor magnetic direction.
考题
单选题Deviation is caused by（）.A
changes in the earth's magnetic fieldB
nearby magnetic land masses or mineral depositsC
magnetic influence inherent to that particular vesselD
the magnetic lines of force not coinciding with the lines of longitude
考题
单选题The magnetic compass magnets are acted on by the horizontal component of the Earth’s total magnetic force. This magnetic force is GREATEST at the（）.A
north magnetic poleB
south magnetic poleC
magnetic prime vertical meridianD
magnetic equator
考题
单选题Deviation in a compass is caused by the（）.A
vessel's geographic positionB
vessel's headingC
earth's magnetic fieldD
influence of the magnetic materials of the vessel
考题
单选题The horizontal angle between the magnetic meridian and the north-south line of the magnetic compass is（）.A
deviationB
variationC
compass errorD
dip
考题
单选题The permanent magnetism of a vessel may change in polarity due to（）.A
being moored for a long time on one headingB
being struck by lightingC
steaming from the north magnetic hemisphere to the south magnetic hemisphereD
loading a homogenous magnetic cargo such as steel plate，iron bars，etc
考题
单选题Which magnetic compass corrector（s）CANNOT be set on a heading of magnetic east or magnetic west（）.A
Heeling magnetB
Flinders barC
Fore-and-aft magnetsD
All of the above can be set on magnetic east or magnetic west headings
考题
单选题The greatest directive force is exerted on the magnetic compass when the（）.A
needles are nearly in line with the meridianB
vessel is near the magnetic polesC
variation is near zeroD
vessel is near the magnetic equator
考题
单选题Which magnetic compass corrector（s）can be set while the vessel is on a heading of magnetic north or magnetic south（）.A
Quadrantal spheresB
Heeling magnetsC
Flinders barD
Fore-and-aft magnets
考题
单选题Magnetic dip is a measurement of the angle between the（）.A
geographic pole and the magnetic poleB
lubber's line and true northC
horizontal and the magnetic line of forceD
compass heading and the magnetic heading
考题
单选题Variation is the angular measurement between（）.A
compass north and magnetic northB
compass north and true northC
magnetic meridian and the geographic meridianD
your vessel's heading and the magnetic meridian
考题
单选题According to the passage, _____.A
we should not worry about the transition of the Earth’s magnetic fieldB
the Earth’s magnetic field will not change for at least 2000 yearsC
the Earth’s magnetic field has decreased its strength rapidlyD
the transition of the Earth’s magnetic field can be controlled by modern science
考题
单选题The principal purpose of adjustment of the magnetic compass is to eliminate（）as far as possible.A
variationB
compass errorC
deviationD
earth's magnetic force
考题
单选题The magnetic compass operates on the principle that（）.A
like magnetic poles attractB
unlike magnetic poles repelC
unlike poles attractD
the poles of the compass line up with the geographic poles of the earth
考题
单选题The line which connects the points of zero magnetic dip is（）.A
An agonic lineB
The magnetic equatorC
A magnetic meridianD
All of the above
考题
单选题Magnetic compass deviation（）.A
varies depending upon the bearing usedB
is the angular difference between magnetic north and compass northC
is published on the compass rose on most nautical chartsD
is the angular difference between geographic and magnetic meridians
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