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）。
2026-02-28 00:00:00:0本报记者 祝佳祺 韦军委员——
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For US energy companies, however, there are huge practical difficulties to be overcome. Venezuela's state-owned oil company, PDVSA, is a shadow of its former self.