1. 选择步长序列（如: n/2, n/4, ..., 1）
第一百三十九条 人民警察办理治安案件，有下列行为之一的，依法给予处分；构成犯罪的，依法追究刑事责任：
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SpaceX rocket fireball linked to plume of polluting lithium
In the meantime, Venezuela's economic crisis has led to the exodus of nearly eight million people who have fled in search of a better life.
Фото: Sergei Grits / AP