The only major economy still growing at a fast clip, China is being unusually forthright in challenging the U.S.-led global order ahead of an April 2 summit on the financial crisis.

In his second rebuke of U.S. leadership this past week, the central bank governor, Zhou Xiaochuan, said China's rapid response to the downturn -- including a 4 trillion yuan ($586 billion) stimulus package -- proved the superiority of its authoritarian, one-party political system.

"Facts speak volumes, and demonstrate that compared with other major economies, the Chinese government has taken prompt, decisive and effective policy measures, demonstrating its superior system advantage when it comes to making vital policy decisions," Zhou said in remarks posted on the People's Bank of China's Web site.