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1. Answer the following questions.

1. What attachments can be used to equip the universal excavator?

2. Why are the backacters with telescopic booms very widely used now?

3. Can hydraulically operated excavators dig trenches with vertical sides on sloping ground?

4. Why is it profitable to change the angle of cutting in the process of digging?

5. Are hydraulically operated excavators more progressive than the rope-operated ones?