I
см. тж. достаточно ~
• Sodium is a vigorous reducing agent.
• A high-powered laser system ...
• Quasars are the most energetic objects known in the universe.
• The most energetic ( or powerful ) propellants give values of about 13,000 fps.
• This is a potent fissile material.
• When intense gamma-ray sources became available, ...
II
• A thick layer of coal ...