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In which of the following are hydrogels used? 1. Controlled drug delivery in patients 2. Mobile air-conditioning systems 3. Preparation of industrial lubricants (UPSC CSP 2024)

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1. In which of the following are hydrogels used? 1. Controlled drug delivery in patients 2. Mobile air-conditioning systems 3. Preparation of industrial lubricants (UPSC CSP 2024)

1 only

1 and 2 only

2 and 3 only

1, 2 and 3

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In which of the following are hydrogels used? 1. Controlled drug delivery in patients 2. Mobile air-conditioning systems 3. Preparation of industrial lubricants (UPSC CSP 2024)

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