BEIJING: China's manufacturing activity barely grew in December though services and construction recovered, an official survey showed on Tuesday (Dec 31), suggesting policy stimulus is trickling into some sectors as the economy braces for new trade risks. The National Bureau of Statistics (NBS) purchasing managers' index (PMI) slowed to 50.1 in December from 50.3 a month prior, staying above the 50-mark separating growth from contraction but missing a median forecast of 50.3 in a Reuters poll.