Register in English refers to the level of formality in language use, and the odd one out in the provided sentences is the technical sentence about the acetylene welding cylinder.
Register in English: Register refers to the level of formality in language use. It helps convey the writer's attitude or feelings towards the subject. In the given sentences, the odd one out in terms of register is: 'With its porous mass interior, an acetylene welding cylinder is dissimilar to other gas cylinders.' This sentence stands out as it uses more technical language compared to the others, making it the odd one in terms of register.
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