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 Ford class is a successor to the Nimitz class. These are the largest and most powerful warships ever built. First aircraft carrier of the class is expected to be commissioned with the US Navy in 2017. It is expected that a total of 9-10 new Ford class aircraft carriers will be built. These will replace the Nimitz and Improved Nimitz class warships.