Is China a bubble economy?

One of the hedge fund managers who has made money as a bear thinks China is a bubble economy ready to pop:

Chanos and the other bears point to several key pieces of evidence that China is heading for a crash.

First, they point to the enormous Chinese economic stimulus effort — with the government spending $900 billion to prop up a $4.3 trillion economy.
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Chang argues that inconsistencies in Chinese official statistics — like the surging numbers for car sales but flat statistics for gasoline consumption — indicate that the Chinese are simply cooking their books
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the Chinese already consume more cement than the rest of the world combined, at 1.4 billion tons per year. But they have dramatically ramped up their ability to produce even more in recent years, leading to an estimated spare capacity of about 340 million tons, which, according to a report prepared earlier this year by Pivot Capital Management, is more than the consumption in the U.S., India and Japan combined.