21 years old. If you take 1944-1923 you get 21 because that would be ho wold they are
B. Loosening the drain plug with a screwdriver
Answer:
There is nothing please put it then i will edit this answer.
Explanation:
The answer is Benching.
Benching and sloping are methods used to protect employees working in excavations from cave–ins. Benches are cuts in the slope that provides protection by removing material at an angle to its floor. They give the slope a stair-step appearance with emphasis on the angles; the flatter the angle, the more the protection. Benches are split into two groups: simple and multiple.
