1982年，习近平同志赴正定工作。在调研中得知，由于粮食征购任务过重，当地一些农民口粮不够，只好偷偷去外县换红薯干儿吃。
（六）放射性同位素，是指化学元素中具有相同原子序数，但质量不同且能发生放射性衰变的核素。
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FirstFT: the day's biggest stories
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Some of the biggest names in music are performing at the Brit Awards this weekend. Sure, there are a lot of awards to be presented, but that's not really what the Brits is about. It's about incredible performances, risqué jokes from the host, and celebrities behaving very badly. It's always a messy night (in the best kind of way).