Chinese manufacturing was at its weakest in more than three years in November despite stimulus measures to bolster the world's No. 2 economy while service industries improved, according to an official survey released on Tuesday. The manufacturing index based on a survey of factory purchasing managers slipped for the fourth straight month, falling to 49.6 in November from 49.8 the previous month. The index is based on a 100-point scale, with the 50-point mark separating expansion from contraction. The latest data highlight the two-speed nature of China's economy as officials try to shift the economy's focus from manufacturing to services in a transition that's proving to be rocky. Growth in the latest quarter fell to a six-year low of 6.9 percent, slightly down from 7 percent in each of the two preceding quarters after repeated interest rate cuts and other stimulus measures

Services, which have helped offset the weakness in manufacturing, showed some improvement. The official measure covering China's service industries rose to 53.6 from 53.1. A sub-index covering new manufacturing orders, seen as an indicator of overall demand, fell to 49.8 from 50.3.