How do those numbers compare to The Avengers opening in China?
Avengers opened on a Saturday which is the largest day for movies in China (same as it is in most places). TDKR and ASM opened on a Monday, so it is not an apples-apples comparison.
However, Avengers' had $17M after its first two days. TDKR will have around $9.5-10M.
Early reports suggest that ASM beat TDKR in China on Day 2 as well.
It is also worth noting that while Avengers made a lot of money in China ($92M) it was not super huge like it was in some of the Latin American countries. MIB3 made $80M, Mission Impossible 4 broke $107M, and like I said earlier, Titanic 3D made $155M back in April.