When you attempt to place a piece of glass tubing into a rubber stopper after the tubing has been fire polished and cooled, you should do D. All of the above.
When inserting a piece of glass tubing that has been fire polished and cooled into a rubber stopper, you should ensure that you:
In conclusion, all of the above are necessary when inserting a piece of glass tubing into a rubber stopper.
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Options for this question include:
A. lubricating the tubing with water or glycerin.
B. using a towel or cotton gloves for protection.
C. twisting the tubing and stopper carefully.
D. all of the above
