China’s factory activity has slipped into contraction in July, ending a four-month growth streak as weaker new orders and persistent demand challenges highlight the need for further policy support from Beijing, analysts said.The manufacturing purchasing managers’ index (PMI) fell to 49.2 in July, down from 50.3 in June, according to data released by the National Bureau of Statistics (NBS) on Friday. The reading fell short of the 50.11 projection from economists polled by the financial data...