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You want to place a piece of glass tubing into a rubber stopper after the tubing has been fire polished and cooled. This is best done by

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.

Respuesta :

rubennagarkoti83

Answer:

a

Explanation:

The history of Poland from 1945 to 1989 spans the period of communist rule imposed over Poland after the end of World War II.

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