HONG KONG (AP) — China’s factory activity shrank for a second month in February, though lower U.S. tariffs could bring about a small boost in the coming weeks. The official manufacturing purchasing managers index, or PMI, slipped to 49 from 49.3 in January, a four-month low, the National Bureau of Statistics reported Wednesday. The figure from its monthly survey of factory managers is measured on a scale of 0 to 100 and indicates contraction when it is below 50. December’s manufacturing PMI