Select reverse, which means selecting a location that is not selected, shift CTRL I
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Operation of the selection
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The marquee tool is all a tool for selecting rules
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Lasso Tool Select Irregular graphic
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When making a circle, use the ruler to pull up two guides and start the pen from the point of intersection, so that the circle is just the right one.
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Add a style to the layer.
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Effect of negative
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PS Note 2--questions about the constituency