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.
Broadly speaking, there are three kinds of aircraft carrier today: larger aircraft carriers that carry both fixed-wing aircraft and helicopters, smaller carriers that operate helicopters, and amphibious ships that have full-length flight decks, hangars, and carry helicopters.