Вопрос из теста по предмету Английский язык

Question

Ответьте на вопрос

What is the main requirement for wood preservation operations to be safe?

Answer

Wood dust or other fine residues generated must be collected.

Answer

Industrial operations with preservative chemicals should be minimal.

Answer

Most wood preservative chemicals should be considered to be hazardous.

Answer

All the industrial activities in this sphere must be licensed.

Ответьте на вопрос What is the main requirement for wood preservation operations to be safe: ответ на тест 236847 - Английский язык