Final answer:
The nurse should hold the tube or bottle at an angle when pouring the suspension and pass the opening through a flame to minimize contamination.
Step-by-step explanation:
The nurse should use the technique of holding the tube or bottle at an angle when pouring the suspension. This helps minimize the potential for airborne contaminants to enter the opening. Additionally, passing the opening of the tube or bottle briefly through a flame before and after the transfer process can discourage airborne contaminants from getting into the sterile liquid.