By Susan Mathew Feb 10 (Reuters) - Emerging market stocks hit a three-week high on Thursday, with tech making up much of that lift, while most developing world currencies were biding time ahead of keenly awaited U.S. inflation data. Investors in riskier assets are bracing for a tough year with most other major central banks in the developed world also adopting tighter monetary policy stances. China's yuan CNY= and Turkey's lira TRY= were little changed, while South Africa's rand ZAR= rallied 0.3% ahead of President Cyril Ramaphosa's state of the nation address at 1700 GMT.