BEIJING (AFP) - Beijing and Washington announced Friday an agreement giving US beef, natural gas and certain financial services access to China's massive market in a deal highlighting the warm ties nurtured by their presidents.The deal was unveiled a month after Chinese President Xi Jinping and Donald Trump launched a 100-day action plan on economic cooperation during their meeting at the US leader's Mar-a-Lago resort in Florida.Trump's Treasury Secretary Steven Mnuchin hailed the agreement with