Some opioid antagonists are not pure antagonists but in fact do produce some weak opioid partial agonist effects, and can produce analgesic effects when administered in high doses to opioid-naive individuals.
Does the US Navy have 10 or 19 Aircraft Carriers? The U.S. Navy operates 19 ships that could be called aircraft carriers, but only considers 10 to be actual carriers. Last week the U.S. Navy accepted USS America, first of the America-class amphibious assault ships, into service.
The United States Navy is a powerhouse. The fleet consists of roughly 430 ships in active service or reserve. The vessels run the gamut from the massive Nimitz-class aircraft carrier, which stretches more than 1,000 feet, to the Los Angeles-class submarine that slithers 900 feet below the ocean surface.