Nasa announces change to its Moon landing plans
Your computer is a cosmic ray detector. Literally.
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描述：给定字符串 num（非负整数）和整数 k，移除 k 位数字，使剩余数字最小。以字符串形式返回（不含前导零）。
Every country supports its aerospace business, while keeping the production at home is vital. At least with Rolls the UK is backing a winner，详情可参考WPS下载最新地址
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