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It might be your keymappings. I notice you are from China, so is it possible that your delete and backspace key are one in the same? If so, CTRL ALT DELETE does in fact reboot the machine. CTRL ALT BACKSPACE is only supposed to kill X.
Also, if you look at the bottom of your questions, it finds threads that are similar to yours (usually the ones you should find from a search before you post ). The link above is someone with similar problems.