The index tracking the sector's development rose 3.7 percentage points from April to 50.2 percent, putting it back in the expansion range, the survey showed.
A reading above 50 percent indicates expansion, while one below 50 percent reflects contraction.
The sector rebounded in May amid faster implementation of pro-growth policies and production resumption in virus-hit areas, said Wang Yong of CMST Development, adding that the weaker recovery of demand compared to that of supply has led to some products being stockpiled.
The sub-index for business volume stood at 53 percent, up 10.4 percentage points from a month earlier, indicating warming demand as COVID-19 impact tapers off, according to the survey.
It predicted stable growth for the sector in the near future, given that the sub-readings for new orders and for enterprises' expectations of business activities both stood in the expansion zone.
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