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
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
A、north magnetic pole B、south magnetic pole C、magnetic prime vertical meridian D、magnetic equator
A、Heeling magnet B、Flinders bar C、Fore-and-aft magnets D、All of the above can be set on magnetic east or magnetic west headings
A、geographic pole and the magnetic pole B、lubber's line and true north C、horizontal and the magnetic line of force D、compass heading and the magnetic heading
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、A.Magnetic materials of the same polarity repel each other and those of opposite polarity attract B、B.The Earth's magnetic lines of force are parallel to the surface of the Earth C、C.Magnetic meridians connect points of equal magnetic variation D、D.The compass needle(s) will,when properly compensated,lie parallel to the isogonic lines of the Earth
A、A.Magnetic materials of the same polarity repel each other and those of opposite polarity attract B、B.The Earth's magnetic lines of force are parallel to the surface of the Earth C、C.Magnetic meridians connect points of equal magnetic variation D、D.The compass needle(s)will,when properly compensated,lie parallel to the isogonic lines of the Earth