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Pipetting is a fundamental laboratory technique used for accurate measurement and transfer of liquids in biochemical experiments. The process begins with selecting an appropriate pipette based on the required volume range, ensuring accuracy and minimizing error. A clean, sterile disposable pipette tip is then firmly attached to the pipette to prevent leakage and contamination. Before aspirating the sample, the pipette is set to _____ ___ ____ _____ ________.
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