Test # 21
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760 questions in 76 tests. Each test contains 10 questions.
Idiom of the Day
knock (something) back/down
to drink something (usually alcohol or medicine)
The medicine tasted terrible but I was able to knock it down.
Class 9 - Practical English Grammar
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Precautions while using Oxygen Therapy
The use of an electrically powered oxygen concentratorcite_ref 10cite_ref 10 or a chemical reaction based unit can create sufficient oxygen for a patient to use immediately, and these units (especially the electrically powered versions) are in widespread usage for home oxygen therapy and portable personal oxygen, with the advantage of being continuous supply without the need for additional deliveries of bulky cylinders.