в соединениях
• Benzoic acid is found free and combined in nature.
• Cobalt is similar to iron and nickel in both its free and combined states.
Источник:
Русско-английский научно-технический словарь
на Gufo.me
• Benzoic acid is found free and combined in nature.
• Cobalt is similar to iron and nickel in both its free and combined states.