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What is the marking method of support line and pressure line in crude oil and silver trading?
Connecting two or more relative low points into a straight line to obtain a support line; Connect two or more relative high points into a straight line to get the pressure line.

The first is the role of support line and pressure line.

The second is the mutual transformation between the support line and the pressure line.

Article 3 Confirmation and Revision of Support Line and Pressure Line